Temporarily fix incompatibility with pyparsing 2.4.0 See merge request idf/esp-idf!4809
@@ -8,5 +8,5 @@ setuptools
pyserial>=3.0
future>=0.15.2
cryptography>=2.1.4
-pyparsing>=2.0.3
+pyparsing>=2.0.3,<2.4.0
pyelftools>=0.22