Finished execute api (#20)

* finished execute-api

* added a missing test

* added another missing test-case

* fixed version

Author: Schubi1981

README.md

@@ -22,7 +22,7 @@ A Java-Library to build SQL-Statements
 <dependency>
   <groupId>de.jaggl.sqlbuilder</groupId>
   <artifactId>sqlbuilder-core</artifactId>
-  <version>2.6.0</version>
+  <version>2.6.1</version>
 </dependency>
 ```
 

pom.xml

@@ -3,7 +3,7 @@
 
   <groupId>de.jaggl.sqlbuilder</groupId>
   <artifactId>sqlbuilder-core</artifactId>
-  <version>2.6.0</version>
+  <version>2.6.1</version>
 
   <packaging>jar</packaging>