Bump version to 1.12.0

Author: mwilliamson

README.md

@@ -49,7 +49,7 @@ Available on [Maven Central](https://central.sonatype.com/artifact/org.zwobble.m
 <dependency>
   <groupId>org.zwobble.mammoth</groupId>
   <artifactId>mammoth</artifactId>
-  <version>1.11.0</version>
+  <version>1.12.0</version>
 </dependency>
 ```
 

pom.xml

@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.zwobble.mammoth</groupId>
   <artifactId>mammoth</artifactId>
-  <version>1.11.0</version>
+  <version>1.12.0</version>
   <packaging>jar</packaging>
   <name>Mammoth</name>
   <description>Convert Word documents to simple and clean HTML</description>