update version to indicate change

if we keep the version string the same, pip will sometimes skip installing our version, and keep the otherwise identical upstream 4.1.2.

netmiko/__init__.py

@@ -1,6 +1,6 @@
 import sys
 
-__version__ = "4.1.2"
+__version__ = "4.1.2.chi01"
 PY_MAJ_VER = 3
 PY_MIN_VER = 7
 MIN_PYTHON_VER = "3.7"