getargspec fix (#121)

* increase version to 2.3.3

* replace getfullargspec with getargspec

* added check if is python3

* 2.3.3

---------

Co-authored-by: Pawel Pawezka <pawel.pawezka@nokia.com>

pom.xml

@@ -8,7 +8,7 @@
   </parent>
   <groupId>org.robotframework</groupId>
   <artifactId>remoteswinglibrary</artifactId>
-  <version>2.3.2</version>
+  <version>2.3.3</version>
   <packaging>jar</packaging>
 
   <name>robotframework-remoteswinglibrary</name>