Support Go Modules

Fixes #1

go.mod

@@ -0,0 +1,18 @@
+module github.com/writeas/web-core
+
+go 1.10
+
+require (
+	github.com/kr/pretty v0.1.0 // indirect
+	github.com/kylemcc/twitter-text-go v0.0.0-20180726194232-7f582f6736ec
+	github.com/microcosm-cc/bluemonday v1.0.2
+	github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	github.com/writeas/impart v1.1.0
+	github.com/writeas/nerds v1.0.0
+	github.com/writeas/openssl-go v1.0.0
+	github.com/writeas/saturday v1.6.0
+	golang.org/x/crypto v0.0.0-20190131182504-b8fe1690c613
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
+	gopkg.in/yaml.v1 v1.0.0-20140924161607-9f9df34309c0 // indirect
+)