Reenable FullStdLibV36

Author: Mikhail Arkhipov

src/Analysis/Engine/Test/AstAnalysisTests.cs

@@ -726,7 +726,6 @@ public async Task FullStdLibV37() {
 
 
         [TestMethod, TestCategory("60s"), Priority(0)]
-        [Ignore("https://github.com/Microsoft/python-language-server/issues/64")]
         public async Task FullStdLibV36() {
             var v = PythonVersions.Python36 ?? PythonVersions.Python36_x64;
             await FullStdLibTest(v);