Migrate to go mod

.gitignore

@@ -1,3 +1,7 @@
 bin/
 tags
 .licenses/
+.idea/
+!.idea/codeStyles
+.DS_Store
+/.env

go.mod

@@ -0,0 +1,20 @@
+module github.com/mat/besticon
+
+// +heroku goVersion go1.15
+
+go 1.15
+
+require (
+	github.com/PuerkitoBio/goquery v1.5.0
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
+	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6
+	github.com/golang/protobuf v1.3.2 // indirect
+	github.com/prometheus/client_golang v1.0.0
+	github.com/prometheus/common v0.6.0 // indirect
+	github.com/prometheus/procfs v0.0.3 // indirect
+	github.com/rs/cors v1.7.0
+	golang.org/x/image v0.0.0-20190703141733-d6a02ce849c9
+	golang.org/x/net v0.0.0-20190724013045-ca1201d0de80
+	golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e // indirect
+	golang.org/x/text v0.3.2 // indirect
+)

go.sum

@@ -0,0 +1,79 @@
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