test refc in CI in Nim 2.0 and later (#39)

* test refc in CI in Nim 2.0 and later

* Update results.nimble

Co-authored-by: Jacek Sieka <arnetheduck@gmail.com>

* Nim 1.2 compilation was fixed

---------

Co-authored-by: Jacek Sieka <arnetheduck@gmail.com>

results.nimble

@@ -21,6 +21,8 @@ proc test(env, path: string) =
 task test, "Runs the test suite":
   for f in ["test_results.nim", "test_results2.nim"]:
     test "", "tests/" & f
+    if (NimMajor, NimMinor) >= (2, 0):
+      test "--mm:refc", "tests/" & f
 
 task bench, "Run benchmark":
   test "-d:release", "benchmarks/benchmark.nim"