Test both dbs (#205)

* move scripts, allow testing both dbs with one cmd

* tidy + vendor

* update test.sh to ignore cache

* put test commands directly in drone.yml

* change CONTRIBUTING slightly

* go ham on the readme

.drone.yml

@@ -31,12 +31,9 @@ steps:
   volumes:
   - name: go-build-cache
     path: /root/.cache/go-build
-  environment:
-    GTS_DB_ADDRESS: postgres
   commands:
-  # `-p 1`      => run maximum one test at a time
-  # `./...`     => run all tests
-  - go test -p 1 ./...
+  - GTS_DB_TYPE="sqlite" GTS_DB_ADDRESS=":memory:" go test -count 1 -p 1 ./...
+  - GTS_DB_TYPE="postgres" GTS_DB_ADDRESS="postgres" go test -count 1 -p 1 ./...
   when:
     event:
       include:
@@ -85,6 +82,6 @@ trigger:
 
 ---
 kind: signature
-hmac: 268d484fd9c5d14834a3e2a1e39cfe605c3898d601d2969dba5c2e11c1ea2f3b
+hmac: 764ac2de691c436bd86c6cc94b862cde2b5558e4de65ff68bb0d227de1736783
 
 ...