module: update go.mod

Author: zchee

go.mod

@@ -1,13 +1,13 @@
 module github.com/go-language-server/protocol
 
-go 1.12
-
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/francoispqt/gojay v1.2.11-0.20190329162224-e46791d21b5e
-	github.com/go-language-server/jsonrpc2 v0.1.2
 	github.com/google/go-cmp v0.3.0
+	github.com/pkg/errors v0.8.1 // indirect
+	github.com/stretchr/testify v1.3.0 // indirect
 	go.uber.org/atomic v1.4.0 // indirect
+	go.uber.org/multierr v1.1.1-0.20180122172545-ddea229ff1df // indirect
 	go.uber.org/zap v1.10.1-0.20190430155229-8a2ee5670ced
-	golang.org/x/xerrors v0.0.0-20190506180316-385005612d73 // indirect
+	golang.org/x/xerrors v0.0.0-20190212162355-a5947ffaace3 // indirect
 )