Remove unused dependencies

packages/0x.js/package.json

@@ -83,11 +83,9 @@
         "@0xproject/web3-wrapper": "^0.1.4",
         "bintrees": "^1.0.2",
         "bn.js": "^4.11.8",
-        "compare-versions": "^3.0.1",
         "ethereumjs-abi": "^0.6.4",
         "ethereumjs-blockstream": "^2.0.6",
         "ethereumjs-util": "^5.1.1",
-        "find-versions": "^2.0.0",
         "js-sha3": "^0.6.1",
         "lodash": "^4.17.4",
         "uuid": "^3.1.0",

packages/0x.js/src/globals.d.ts

@@ -25,18 +25,6 @@ declare module '*.json' {
     /* tslint:enable */
 }
 
-// find-version declarations
-declare function findVersions(version: string): string[];
-declare module 'find-versions' {
-    export = findVersions;
-}
-
-// compare-version declarations
-declare function compareVersions(firstVersion: string, secondVersion: string): number;
-declare module 'compare-versions' {
-    export = compareVersions;
-}
-
 declare module 'ethereumjs-abi' {
     const soliditySHA3: (argTypes: string[], args: any[]) => Buffer;
 }