Added LGTM

Author: giswqs

.lgtm.yml

@@ -0,0 +1,12 @@
+extraction:
+    python:
+        python_setup:
+            version: 3
+        after_prepare:
+            - python3 -m pip install --upgrade --user flake8
+        before_index:
+            - python3 -m flake8 --version # flake8 3.6.0 on CPython 3.6.5 on Linux
+            # stop the build if there are Python syntax errors or undefined names
+            - python3 -m flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
+            # exit-zero treats all errors as warnings.  The GitHub editor is 127 chars wide
+            - python3 -m flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics