setup: updates package name

Signed-off-by: Pamfilos Fokianos <pamfilosf@gmail.com>

Author: pamfilos

setup.py

@@ -74,7 +74,7 @@
                         f.read()).group('version')
 
 setup(
-    name='cap-client',
+    name='cap_client',
     version=version,
     description=__doc__,
     long_description=readme + '\n\n' + history,