Move our contract templates to accept Provider instead of Web3Wrapper

packages/types/CHANGELOG.json

@@ -1,4 +1,13 @@
 [
+    {
+        "version": "0.6.0",
+        "changes": [
+            {
+                "note": "Add Provider type",
+                "pr": 501
+            }
+        ]
+    },
     {
         "version": "0.5.0",
         "changes": [

packages/types/src/index.ts

@@ -1,5 +1,9 @@
 import { BigNumber } from 'bignumber.js';
 
+export interface Provider {
+    sendAsync(payload: JSONRPCRequestPayload, callback: (err: Error, result: JSONRPCResponsePayload) => void): void;
+}
+
 export type ContractAbi = AbiDefinition[];
 
 export type AbiDefinition = FunctionAbi | EventAbi;