Update utils in top level package to 0.3.0

package.json

@@ -16,7 +16,7 @@
         "mnemonic": "concert load couple harbor equip island argue ramp clarify fence smart topic"
     },
     "devDependencies": {
-        "@0xproject/utils": "^0.2.0",
+        "@0xproject/utils": "^0.3.0",
         "async-child-process": "^1.1.1",
         "ethereumjs-testrpc": "^6.0.3",
         "lerna": "^2.5.1",

yarn.lock

@@ -2,15 +2,6 @@
 # yarn lockfile v1
 
 
-"@0xproject/utils@^0.2.0":
-  version "0.2.4"
-  resolved "https://registry.yarnpkg.com/@0xproject/utils/-/utils-0.2.4.tgz#d84d0737f47730e5724a76797d30e716b587a0cf"
-  dependencies:
-    bignumber.js "~4.1.0"
-    js-sha3 "^0.7.0"
-    lodash "^4.17.4"
-    web3 "^0.20.0"
-
 "@types/accounting@^0.4.1":
   version "0.4.1"
   resolved "https://registry.yarnpkg.com/@types/accounting/-/accounting-0.4.1.tgz#865d9f5694fd7c438fba34eb4bc82eec6f34cdd5"