requirements-travis.txt: Update to inspektor 0.2.0

The new inspektor release brings some important features,
such as verify unused imports (an item that was on
my TODO list for way longer that I'd like to admit).
Signed-off-by: NLucas Meneghel Rodrigues <lmr@scylladb.com>

requirements-travis.txt

@@ -5,5 +5,5 @@ tox==1.5.0
 virtualenv==1.9.1
 simplejson==3.8.1
 MySQL-python==1.2.5
-inspektor==0.1.19
+inspektor==0.2.0
 autotest==0.16.2