restricted ujson < 2.0 as fresh versions now fail with some unicode decode errors

Author: Lev Rubel

requirements_dev.txt

@@ -12,7 +12,7 @@ jaeger-client>=4.1.0
 opentracing>=2.2.0
 motor>=2.0.0
 pytz==2019.3
-ujson>=1.35
+ujson<2.0.0
 
 coverage==5.0.3
 flake8==3.7.9

setup.py

@@ -38,12 +38,12 @@
  install_requires=requirements,
  extras_require={
  "mongo": ["motor>=2.0.0"],
- "ujson": ["ujson>=1.35"],
+ "ujson": ["ujson<2.0.0"],
  "pytz": ["pytz"],
  "jaegertracing": ["jaeger-client>=4.1.0", "opentracing>=2.2.0"],
  "all": [
  "motor>=2.0.0",
- "ujson>=1.35",
+ "ujson<2.0.0",
  "pytz",
  "jaeger-client>=4.1.0",
  "opentracing>=2.2.0",