error strings should not be capitalized (ST1005)

goveralls.go

@@ -265,7 +265,7 @@ func processParallelFinish(jobID, token string) error {
 	defer res.Body.Close()
 	bodyBytes, err := ioutil.ReadAll(res.Body)
 	if err != nil {
-		return fmt.Errorf("Unable to read response body from coveralls: %s", err)
+		return fmt.Errorf("unable to read response body from coveralls: %s", err)
 	}
 
 	if res.StatusCode >= http.StatusInternalServerError && *shallow {
@@ -274,12 +274,12 @@ func processParallelFinish(jobID, token string) error {
 	}
 
 	if res.StatusCode != 200 {
-		return fmt.Errorf("Bad response status from coveralls: %d\n%s", res.StatusCode, bodyBytes)
+		return fmt.Errorf("bad response status from coveralls: %d\n%s", res.StatusCode, bodyBytes)
 	}
 
 	var response WebHookResponse
 	if err = json.Unmarshal(bodyBytes, &response); err != nil {
-		return fmt.Errorf("Unable to unmarshal response JSON from coveralls: %s\n%s", err, bodyBytes)
+		return fmt.Errorf("unable to unmarshal response JSON from coveralls: %s\n%s", err, bodyBytes)
 	}
 
 	if !response.Done {
@@ -499,7 +499,7 @@ func process() error {
 	defer res.Body.Close()
 	bodyBytes, err := ioutil.ReadAll(res.Body)
 	if err != nil {
-		return fmt.Errorf("Unable to read response body from coveralls: %s", err)
+		return fmt.Errorf("unable to read response body from coveralls: %s", err)
 	}
 
 	if res.StatusCode >= http.StatusInternalServerError && *shallow {
@@ -508,11 +508,11 @@ func process() error {
 	}
 
 	if res.StatusCode != 200 {
-		return fmt.Errorf("Bad response status from coveralls: %d\n%s", res.StatusCode, bodyBytes)
+		return fmt.Errorf("bad response status from coveralls: %d\n%s", res.StatusCode, bodyBytes)
 	}
 	var response Response
 	if err = json.Unmarshal(bodyBytes, &response); err != nil {
-		return fmt.Errorf("Unable to unmarshal response JSON from coveralls: %s\n%s", err, bodyBytes)
+		return fmt.Errorf("unable to unmarshal response JSON from coveralls: %s\n%s", err, bodyBytes)
 	}
 	if response.Error {
 		return errors.New(response.Message)