Drop Coveralls

pom.xml

diff --git a/pom.xml b/pom.xml
index a22b165..3bb878a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -312,8 +312,6 @@
           java.base/java.lang=ALL-UNNAMED</argLine>

         <!-- versions below 3.0.0 do not work with java 9 -->

         <commons.javadoc.version>3.0.0</commons.javadoc.version>

-        <!-- coverall version 4.3.0 does not work with java 9, see https://github.com/trautonen/coveralls-maven-plugin/issues/112 -->

-        <coveralls.skip>true</coveralls.skip>

       </properties>

     </profile>