Move types used in public interfaces to dependencies

packages/subproviders/package.json

@@ -36,6 +36,8 @@
         "@ledgerhq/hw-app-eth": "^4.3.0",
         "@ledgerhq/hw-transport-u2f": "^4.3.0",
         "@types/hdkey": "^0.7.0",
+        "@types/ganache-core": "^2.1.0",
+        "@types/eth-lightwallet": "^3.0.0",
         "bip39": "^2.5.0",
         "bn.js": "^4.11.8",
         "eth-lightwallet": "^3.0.1",
@@ -52,7 +54,6 @@
     "devDependencies": {
         "@0xproject/tslint-config": "^1.0.6",
         "@types/bip39": "^2.4.0",
-        "@types/eth-lightwallet": "^3.0.0",
         "@types/bn.js": "^4.11.0",
         "@types/ethereumjs-tx": "^1.0.0",
         "@types/hdkey": "^0.7.0",
@@ -61,7 +62,6 @@
         "@types/mocha": "^2.2.42",
         "@types/node": "^8.0.53",
         "@types/sinon": "^2.2.2",
-        "@types/ganache-core": "^2.1.0",
         "chai": "^4.0.1",
         "chai-as-promised": "^7.1.0",
         "copyfiles": "^2.0.0",