Update .gitignore (apache#3199)

MarisaKirisame · tqchen · commit 493f90ff5cd0 · 2019-05-16T11:54:43.000-07:00
diff --git a/.gitignore b/.gitignore
@@ -216,3 +216,7 @@ patched.txt
 # Python type checking
 .mypy_cache/
 .pyre/
+
+# pipenv file
+Pipfile
+Pipfile.lock
