Add missing comma in run_tests.py
diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index 5509237..cd49dfa 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -933,7 +933,7 @@
'clang3.4', 'clang3.5', 'clang3.6', 'clang3.7',
'vs2010', 'vs2013', 'vs2015',
'python2.7', 'python3.4',
- 'node0.12', 'node4', 'node5', 'node6', 'node7'
+ 'node0.12', 'node4', 'node5', 'node6', 'node7',
'coreclr'],
default='default',
help='Selects compiler to use. Allowed values depend on the platform and language.')