Remove build definition for supporting JDK 7

Fixes gh-71

Author: kazuki43zoo

pom.xml

@@ -63,17 +63,6 @@
     <findbugs.onlyAnalyze>org.mybatis.scripting.velocity.*</findbugs.onlyAnalyze>
     <gcu.product>Velocity</gcu.product>
     <module.name>org.mybatis.scripting.velocity</module.name>
-
-    <!-- Maven set to java 7 to align with new velocity -->
-    <maven.compiler.source>1.7</maven.compiler.source>
-    <maven.compiler.target>1.7</maven.compiler.target>
-    <maven.compiler.testTarget>1.8</maven.compiler.testTarget>
-    <maven.compiler.testSource>1.8</maven.compiler.testSource>
-
-    <!-- Animal Sniffer Signature -->
-    <signature.group>org.codehaus.mojo.signature</signature.group>
-    <signature.artifact>java17</signature.artifact>
-    <signature.version>1.0</signature.version>
   </properties>
 
   <dependencies>