Announce pending deprecation of python3.4 branch

Signed-off-by: Aleksei Stepanov <penguinolog@gmail.com>

Author: penguinolog

exec_helpers/__init__.py

@@ -33,6 +33,7 @@
 )
 
 import pkg_resources
+import warnings
 
 from .proc_enums import ExitCodes
 
@@ -65,6 +66,11 @@
     except ImportError:
         pass
 
+warnings.warn(
+    "Python 3.4 is going to reach EOL. Please update to fresh python and use newer versions of Exec-Helpers.",
+    PendingDeprecationWarning
+)
+
 __author__ = "Alexey Stepanov"
 __author_email__ = "penguinolog@gmail.com"
 __maintainers__ = {