Merge pull request #231 from VesnaT/req_pyqtgraph

setup: Add pyqtgraph dependency

Author: ajdapretnar

setup.py

@@ -76,7 +76,8 @@
             'more-itertools',
             # required to get current timezone
             # adding it does not hurt, Pandas have it as a dependency
-            'python-dateutil'
+            'python-dateutil',
+            'pyqtgraph>=0.12.2,!=0.12.4'
         ],
         extras_require={
             'test': ['coverage'],