Merge pull request #2 from starkbank/fix/index-case-insensitive

fixed case insensitive requires in index.js

Author: matheuscferraz

index.js

@@ -1,5 +1,5 @@
 exports.Signature = require("./lib/signature").Signature;
-exports.PublicKey = require("./lib/publickey").PublicKey;
-exports.PrivateKey = require("./lib/privatekey").PrivateKey;
+exports.PublicKey = require("./lib/publicKey").PublicKey;
+exports.PrivateKey = require("./lib/privateKey").PrivateKey;
 exports.Ecdsa = require("./lib/ecdsa");
 exports.utils = require("./lib/utils/utils");