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-pg/pg/v10/pgjson/provider.go

@@ -0,0 +1,43 @@
+package pgjson
+
+import (
+	"io"
+)
+
+var provider Provider = StdProvider{}
+
+func SetProvider(p Provider) {
+	provider = p
+}
+
+type Provider interface {
+	Marshal(v interface{}) ([]byte, error)
+	Unmarshal(data []byte, v interface{}) error
+	NewEncoder(w io.Writer) Encoder
+	NewDecoder(r io.Reader) Decoder
+}
+
+type Decoder interface {
+	Decode(v interface{}) error
+	UseNumber()
+}
+
+type Encoder interface {
+	Encode(v interface{}) error
+}
+
+func Marshal(v interface{}) ([]byte, error) {
+	return provider.Marshal(v)
+}
+
+func Unmarshal(data []byte, v interface{}) error {
+	return provider.Unmarshal(data, v)
+}
+
+func NewEncoder(w io.Writer) Encoder {
+	return provider.NewEncoder(w)
+}
+
+func NewDecoder(r io.Reader) Decoder {
+	return provider.NewDecoder(r)
+}