fix lint

Author: umarcor

vunit/test/acceptance/test_external_run_scripts.py

@@ -110,7 +110,9 @@ def test_vhdl_json4vhdl_example_project(self):
     def test_vhdl_array_example_project(self):
         self.check(join(ROOT, "examples", "vhdl", "array", "run.py"))
 
-    @unittest.skipIf(GHDLInterface.determine_backend("") == "mcode", "mcode backend does not support interfacing with external C code; you should use GCC or LLVM backends")
+    @unittest.skipIf(GHDLInterface.determine_backend("") == "mcode",
+                     "mcode backend does not support interfacing with external C code;\n\
+                     you should use GCC or LLVM backends")
     def test_vhdl_array_axis_vcs_example_project(self):
         self.check(join(ROOT, "examples", "vhdl", "array_axis_vcs", "run.py"))