update anaconda-client on travis

Author: mattip

tools/upload_to_anaconda_posix.sh

@@ -4,6 +4,6 @@ set -ex
 # Note that the anaconda-client package on PyPI is too old. Install from github
 # tag instead:
 echo $(python -c "import sys; print(sys.version)")
-pip install -q git+https://github.com/Anaconda-Platform/anaconda-client@1.7.2
+pip install -q git+https://github.com/Anaconda-Platform/anaconda-client@1.8.0
 upload_to_anaconda