Update requirements.txt

Author: keigohtr

requirements.txt

@@ -1,4 +1,4 @@
-grpcio==1.18.0
-grpcio-tools==1.18.0
-fluent-logger==0.9.3
-python-json-logger==0.1.10
+grpcio>=1.13.0 # Apache-2.0
+grpcio-tools>=1.13.0 # Apache-2.0
+fluent-logger>=0.9.3 # Apache-2.0
+python-json-logger>=0.1.9 # BSD

test-requirements.txt

@@ -1,7 +1,7 @@
 drucker==0.4.5
-coverage==4.5.2
-nose==1.3.7
-pytest==4.1.1
-py==1.7.0
-codecov==2.0.15
-grpcio-testing==1.18.0
+coverage>=4.0.3
+nose>=1.3.7
+pytest
+py>=1.4.31
+codecov>=1.4.0
+grpcio-testing>=1.13.0