switch to arrow 0.15.2

Author: nickmaccarthy

requirements-2.txt

@@ -1,14 +1,14 @@
 appdirs==1.4.3
 args==0.1.0
-arrow==0.7.0
+arrow==0.15.2
 clint==0.5.1
 linecache2==1.0.0
 packaging==16.8
-pkginfo==1.4.1
+pkginfo==1.4.2
 pyparsing==2.2.0
 python-dateutil==2.6.0
 requests==2.13.0
-requests-toolbelt==0.7.1
+requests-toolbelt>=0.8.0
 six==1.10.0
 traceback2==1.4.0
 twine>=1.8.1