Bump doctrine/dbal from 2.9.0 to 2.9.1 (#878)

Bumps [doctrine/dbal](https://github.com/doctrine/dbal) from 2.9.0 to 2.9.1.
<details>
<summary>Release notes</summary>

*Sourced from [doctrine/dbal's releases](https://github.com/doctrine/dbal/releases).*

> # Release v2.9.1
> 
> [![Build Status](https://travis-ci.org/doctrine/dbal.svg?branch=v2.9.1)](https://travis-ci.org/doctrine/dbal)
> 
> This release fixes regressions introduced in v2.9.0 and issues specific to the SQL Anywhere platform.
> 
> - Total issues resolved: **11**
> 
> **MySQL, Schema Introspection:**
> 
> - [3393: Fixed parsing MySQL create table flags (options without a value)](https://github-redirect.dependabot.com/doctrine/dbal/pull/3393) thanks to [**morozov**](https://github.com/morozov) and [**AdrianSherwood**](https://github.com/AdrianSherwood)
> - [3398: BC Break in 2.9.0 for MySQL Tables containing partitions](https://github-redirect.dependabot.com/doctrine/dbal/issues/3398) thanks to [**bcremer**](https://github.com/bcremer)
> 
> **SQL Anywhere:**
> 
> - [3375: &#91;SQL Anywhere&#93; Fix bound parameter references in PHP 7](https://github-redirect.dependabot.com/doctrine/dbal/pull/3375) thanks to [**deeky666**](https://github.com/deeky666)
> - [3378: &#91;SQL Anywhere&#93; Fix query limit values &quot;0&quot; and &quot;null&quot;](https://github-redirect.dependabot.com/doctrine/dbal/pull/3378) thanks to [**deeky666**](https://github.com/deeky666)
> - [3385: &#91;SQL Anywhere&#93; Fix fetching empty values via fetchAll()](https://github-redirect.dependabot.com/doctrine/dbal/pull/3385) thanks to [**deeky666**](https://github.com/deeky666)
> - [3386: &#91;SQL Anywhere&#93; Fix view schema introspection test](https://github-redirect.dependabot.com/doctrine/dbal/pull/3386) thanks to [**deeky666**](https://github.com/deeky666)
> 
> **Schema Comparison:**
> 
> - [3382: Reverted strict comparison back to loose because of a new regression](https://github-redirect.dependabot.com/doctrine/dbal/pull/3382) thanks to [**morozov**](https://github.com/morozov) and [**Majkl578**](https://github.com/Majkl578)
> 
> **Connections:**
> 
> - [3305: Fix Fetch mode query in MasterSlaveConnection](https://github-redirect.dependabot.com/doctrine/dbal/pull/3305) thanks to [**BradCrumb**](https://github.com/BradCrumb)
> 
> **Cache:**
> 
> - [3381: ResultCacheStatement lost its cache capability on fetchAll method](https://github-redirect.dependabot.com/doctrine/dbal/pull/3381) thanks to [**roger-codina**](https://github.com/roger-codina)
> 
> **Documentation:**
> 
> - [3392: fixed annotations of parameter $columns in Table](https://github-redirect.dependabot.com/doctrine/dbal/pull/3392) thanks to [**LukasVitek**](https://github.com/LukasVitek) and [**ricardofiorani**](https://github.com/ricardofiorani)
</details>
<details>
<summary>Commits</summary>

- [`ec74d6e`](ec74d6e300) Release v2.9.1
- [`f3711a7`](f3711a7506) Merge pull request [#3404](https://github-redirect.dependabot.com/doctrine/dbal/issues/3404) from greg0ire/update_chat_link
- [`7ce636b`](7ce636bf49) Merge branch 'bpo/2.9/#3392' into 2.9
- [`b84603b`](b84603b991) Fixed annotation and name of parameter $columnsNames in Table
- [`5d4f933`](5d4f9335a2) Merge branch 'bpo/2.9/#3393' into 2.9
- [`b18f63c`](b18f63ccbf) Fixed parsing MySQL create table flags (options without a value)
- [`62dacc0`](62dacc09e9) Merge branch 'bpo/2.9/#3381' into 2.9
- [`79e369e`](79e369e886) ResultCacheStatement lost its cache capability on fetchAll method
- [`125fb5e`](125fb5e71a) Merge branch 'bpo/2.9/#3305' into 2.9
- [`f6dd134`](f6dd134417) Fix Fetch mode query in MasterSlaveConnection
- Additional commits viewable in [compare view](https://github.com/doctrine/dbal/compare/v2.9.0...v2.9.1)
</details>
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composer.lock

@@ -274,16 +274,16 @@
         },
         {
             "name": "doctrine/dbal",
-            "version": "v2.9.0",
+            "version": "v2.9.1",
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-                "reference": "21fdabe2fc01e004e1966f200d900554876bc63c"
+                "reference": "ec74d6e300d78fbc896669c3ca57ef9719adc9c6"
             },
             "dist": {
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-                "url": "https://api.github.com/repos/doctrine/dbal/zipball/21fdabe2fc01e004e1966f200d900554876bc63c",
-                "reference": "21fdabe2fc01e004e1966f200d900554876bc63c",
+                "url": "https://api.github.com/repos/doctrine/dbal/zipball/ec74d6e300d78fbc896669c3ca57ef9719adc9c6",
+                "reference": "ec74d6e300d78fbc896669c3ca57ef9719adc9c6",
                 "shasum": ""
             },
             "require": {
@@ -352,7 +352,7 @@
                 "php",
                 "queryobject"
             ],
-            "time": "2018-12-04T04:39:48+00:00"
+            "time": "2018-12-14T04:51:13+00:00"
         },
         {
             "name": "doctrine/event-manager",