Missing required Java version fix #864

Author: jknack

README.md

@@ -30,6 +30,8 @@ Handlebars provides the power necessary to let you build semantic templates effe
 
  The [Handlebars.java blog](https://jknack.github.io/handlebars.java) is a good place for getting started too. Javadoc is available at [javadoc.io](https://javadoc.io/doc/com.github.jknack/handlebars).
 
+  Since 4.3.0 release Handlebars.java requires Java 8 or higher.
+
 ## Maven
 #### Stable version: [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.jknack/handlebars/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.jknack/handlebars)
 
@@ -42,10 +44,6 @@ Handlebars provides the power necessary to let you build semantic templates effe
   </dependency>
 ```
 
-#### Development version
-
-SNAPSHOT versions are NOT synchronized to Central. If you want to use a snapshot version you need to add the https://oss.sonatype.org/content/repositories/snapshots/ repository to your pom.xml.
-
 ### Loading templates
 Templates are loaded using the ```TemplateLoader``` class. Handlebars.java provides three implementations of a ```TemplateLoader```:
  * ClassPathTemplateLoader (default)

pom.xml

@@ -398,5 +398,7 @@
     <jacoco.version>0.8.7</jacoco.version>
     <maven.build.timestamp.format>yyyy-MM-dd HH:mm:ssa</maven.build.timestamp.format>
     <timestamp>${maven.build.timestamp}</timestamp>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
   </properties>
 </project>