fix minor spelling error

theano/configdefaults.py

@@ -1249,7 +1249,7 @@ def check_mkl_openmp():
     try:
         import mkl
         if '2018' in mkl.get_version_string():
-            raise RuntimeError('To use MKL 2018 with Theano you MUST set "MKL_THREADING_LAYER=GNU" in your environement.')
+            raise RuntimeError('To use MKL 2018 with Theano you MUST set "MKL_THREADING_LAYER=GNU" in your environment.')
     except ImportError:
         raise RuntimeError("""
 Could not import 'mkl'.  Either install mkl-service with conda or set