upgrade linter and cleanup makefile (#126)

pkg/auth/jwt.go

@@ -37,7 +37,7 @@ import (
 )
 
 var (
-	errAuthentication = errors.New("Authentication failed, check your access credentials")
+	errAuthentication = errors.New("authentication failed, check your access credentials")
 	errNoAuthToken    = errors.New("JWT token missing")
 	errReadingToken   = errors.New("JWT internal data is malformed")
 	errClaimsFormat   = errors.New("encrypted jwt claims not in the right format")

pkg/auth/jwt_test.go

@@ -63,7 +63,7 @@ func TestJWTAuthenticate(t *testing.T) {
 	}
 	// Test-2 : JWTAuthenticate() return an error because of a tampered jwt
 	if _, err := JWTAuthenticate(badToken); err != nil {
-		funcAssert.Equal("Authentication failed, check your access credentials", err.Error())
+		funcAssert.Equal("authentication failed, check your access credentials", err.Error())
 	}
 	// Test-3 : JWTAuthenticate() return an error because of an empty jwt
 	if _, err := JWTAuthenticate(""); err != nil {