Add LGTM badge

Add LGTM badge

readme.md

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+[![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/AlexArcPy/registrant.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/AlexArcPy/registrant/context:python)
+
 ### General
 
 This Python package is used for generating HTML reports about the contents of Esri geodatabases. It supports working with Esri personal/file geodatabases as well as RDBMS enterprise geodatabases (however, it also works with RDBMS databases that were not geodatabase enabled).
@@ -201,4 +203,4 @@ Did you find a bug? Do you need report to include some other information? Please
 
 ### Licensing
 
-MIT
+MIT