Disable tests that access network resources.
--- a/porterstemmer_stem_string_test.go
+++ b/porterstemmer_stem_string_test.go
@@ -10,6 +10,7 @@
 )
 
 func TestStemString(t *testing.T) {
+	t.Skip("Skipping tests that attempts to access network resources.")
 
 	testDataDirName := "testdata"
 
