ci: upgrade golangci-lint to v1.16.0

see golangci/golangci-lint#387

Author: markus-wa

.travis.yml

@@ -27,7 +27,7 @@ before_script:
   - git fetch
 
   # Install golangci-lint
-  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $GOPATH/bin v1.15.0
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $GOPATH/bin v1.16.0
 
   # Download test data
   - pushd cs-demos && git lfs pull -I '*' && popd

parsing.go

@@ -25,14 +25,14 @@ const (
 // Parsing errors
 var (
 	// ErrCancelled signals that parsing was cancelled via Parser.Cancel()
-	ErrCancelled = errors.New("Parsing was cancelled before it finished (ErrCancelled)")
+	ErrCancelled = errors.New("parsing was cancelled before it finished (ErrCancelled)")
 
 	// ErrUnexpectedEndOfDemo signals that the demo is incomplete / corrupt -
 	// these demos may still be useful, check how far the parser got.
-	ErrUnexpectedEndOfDemo = errors.New("Demo stream ended unexpectedly (ErrUnexpectedEndOfDemo)")
+	ErrUnexpectedEndOfDemo = errors.New("demo stream ended unexpectedly (ErrUnexpectedEndOfDemo)")
 
 	// ErrInvalidFileType signals that the input isn't a valid CS:GO demo.
-	ErrInvalidFileType = errors.New("Invalid File-Type; expecting HL2DEMO in the first 8 bytes")
+	ErrInvalidFileType = errors.New("invalid File-Type; expecting HL2DEMO in the first 8 bytes (ErrInvalidFileType)")
 )
 
 // ParseHeader attempts to parse the header of the demo and returns it.