Move contracts-test-utils to dev dependencies

packages/metacoin/package.json

@@ -33,7 +33,6 @@
         "@0x/abi-gen": "^2.0.5",
         "@0x/abi-gen-templates": "^2.0.1",
         "@0x/base-contract": "^5.0.1",
-        "@0x/contracts-test-utils": "^3.0.7",
         "@0x/sol-coverage": "^2.0.6",
         "@0x/sol-profiler": "^3.1.1",
         "@0x/sol-trace": "^2.0.7",
@@ -52,6 +51,7 @@
     },
     "devDependencies": {
         "@0x/dev-utils": "^2.1.2",
+        "@0x/contracts-test-utils": "^3.0.7",
         "@0x/sol-compiler": "^3.1.2",
         "chai": "^4.0.1",
         "chai-as-promised": "^7.1.0",