Updated formatting and CI to be in line with more recent versions of go

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        goVer: [1.11, 1.12, 1.13]
+        goVer: [1.16, 1.17, 1.18]
 
     steps:
     - name: Set up Go ${{ matrix.goVer }}

context/context-legacy.go

@@ -1,3 +1,4 @@
+//go:build !go1.7
 // +build !go1.7
 
 package context

context/context.go

@@ -1,3 +1,4 @@
+//go:build go1.7
 // +build go1.7
 
 package context