Remove trailing whitespace from lib/pbxWriter.js (#35)

diff --git a/lib/pbxWriter.js b/lib/pbxWriter.js
index ae719d9..1f266d9 100644
--- a/lib/pbxWriter.js
+++ b/lib/pbxWriter.js
@@ -214,7 +214,7 @@
         } else if (isObject(entry)) {
             this.write('{\n');
             this.indentLevel++;
-            
+
             this.writeObject(entry);
 
             this.indentLevel--;
@@ -286,7 +286,7 @@
 
             if (isArray(obj)) {
                 output.push(f("%s = (", key));
-                
+
                 for (var i=0; i < obj.length; i++) {
                     output.push(f("%s, ", obj[i]))
                 }