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/tmthrgd/go-hex/.travis.yml

@@ -0,0 +1,11 @@
+language: go
+go:
+    - 1.10.x
+    - 1.11.x
+    - 1.12.x
+    - 1.13.x
+    - tip
+matrix:
+    fast_finish: true
+    allow_failures:
+        - go: tip