Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig

vendor/github.com/go-fed/activity/pub/version.go

@@ -0,0 +1,15 @@
+package pub
+
+import (
+	"fmt"
+)
+
+const (
+	// Version string, used in the User-Agent
+	version = "v1.0.0"
+)
+
+// goFedUserAgent returns the user agent string for the go-fed library.
+func goFedUserAgent() string {
+	return fmt.Sprintf("(go-fed/activity %s)", version)
+}