fix struct json tag fields

connegmatcher.go

@@ -81,20 +81,20 @@ type MatchConneg struct {
 	// Query string parameter key to override encoding negotiation. Default: ""
 	ForceEncodingQueryString string   `json:"force_encoding_query_string,omitempty"`
 	// Variable name (will be prefixed with `conneg_`) to hold result of content negotiation. Default: ""
-	VarType                  string   `json:"var_type, omitempty"`
+	VarType                  string   `json:"var_type,omitempty"`
 	// Variable name (will be prefixed with `conneg_`) to hold result of language negotiation. Default: ""
-	VarLanguage              string   `json:"var_language, omitempty"`
+	VarLanguage              string   `json:"var_language,omitempty"`
 	// Variable name (will be prefixed with `conneg_`) to hold result of charset negotiation. Default: ""
-	VarCharset               string   `json:"var_charset, omitempty"`
+	VarCharset               string   `json:"var_charset,omitempty"`
 	// Variable name (will be prefixed with `conneg_`) to hold result of encoding negotiation. Default: ""
-	VarEncoding              string   `json:"var_encoding, omitempty"`
+	VarEncoding              string   `json:"var_encoding,omitempty"`
 
 	// the following fields are populated internally/computationally
-	MatchTTypes     []contenttype.MediaType
-	MatchTLanguages []language.Tag
-	MatchTCharsets  []CharsetOrEncoding
-	MatchTEncodings []CharsetOrEncoding
-	LanguageMatcher language.Matcher
+	MatchTTypes     []contenttype.MediaType	`json:"omitempty"`
+	MatchTLanguages []language.Tag		`json:"omitempty"`
+	MatchTCharsets  []CharsetOrEncoding	`json:"omitempty"`
+	MatchTEncodings []CharsetOrEncoding	`json:"omitempty"`
+	LanguageMatcher language.Matcher	`json:"omitempty"`
 	logger          *zap.Logger
 }