Merge pull request #628 from max-sixty/build-warnings

Fix build warnings & add CI

.azure/azure-pipelines.yml

@@ -21,5 +21,5 @@ steps:
       rustc -Vv
       echo "##vso[task.prependpath]$HOME/.cargo/bin"
     displayName: Install Rust
-  - bash: RUSTFLAGS="-D warnings" cargo test
+  - bash: RUSTFLAGS="-D warnings" cargo test --all-features
     displayName: Run tests

src/commands/config.rs

@@ -117,7 +117,7 @@ pub fn config(
         let key = v.to_string();
 
         if result.contains_key(&key) {
-            result.remove(&key);
+            result.swap_remove(&key);
             config::write(&result, &configuration)?;
         } else {
             return Err(ShellError::string(&format!(