Merge pull request #57 from Mastercard/1.5.6-release

Bumping pom for 1.5.6 release

Author: danny-gallagher

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.mastercard.developer</groupId>
     <artifactId>oauth1-signer</artifactId>
-    <version>1.5.5</version>
+    <version>1.5.6</version>
     <packaging>jar</packaging>
     <description>Zero dependency library for generating a Mastercard API compliant OAuth signature</description>
     <url>https://github.com/Mastercard/oauth1-signer-java</url>