Allow more than 1 class per file

Felt silly that refactoring a component defined as a function to a class with a helper function caused a tslint violation

packages/instant/tslint.json

@@ -2,6 +2,7 @@
     "extends": ["@0x/tslint-config"],
     "rules": {
         "custom-no-magic-numbers": false,
-        "semicolon": [true, "always", "ignore-bound-class-methods"]
+        "semicolon": [true, "always", "ignore-bound-class-methods"],
+        "max-classes-per-file": false
     }
 }