Fix travis by freezing pyparsing version

tkruse · tkruse · commit 2c47e0004aea · 2020-05-05T16:50:17.000+09:00
diff --git a/test-requirements b/test-requirements
@@ -2,3 +2,4 @@
 # 5.x requires python 3.5
 pytest>=4.6,<5.0
 pytest-cov
+pyparsing=2.4.0
