bn -> BN canonical capitalization

lib/point.js

@@ -1,4 +1,4 @@
-var bn = require('./bn');
+var BN = require('./bn');
 var elliptic = require('elliptic');
 
 var ec = elliptic.curves.secp256k1;
@@ -20,18 +20,18 @@ Point.getG = function() {
 };
 
 Point.getN = function() {
-  return bn(ec.curve.n.toArray());
+  return BN(ec.curve.n.toArray());
 };
 
 Point.prototype._getX = Point.prototype.getX;
 Point.prototype.getX = function() {
-  var n = bn(this._getX().toArray());
-  return bn(this._getX().toArray());
+  var n = BN(this._getX().toArray());
+  return BN(this._getX().toArray());
 };
 
 Point.prototype._getY = Point.prototype.getY;
 Point.prototype.getY = function() {
-  return bn(this._getY().toArray());
+  return BN(this._getY().toArray());
 };
 
 //https://www.iacr.org/archive/pkc2003/25670211/25670211.pdf