Fix broken test for python 3.4

Error message from azure DevOps:
```
Version spec 3.4 for architecture x64 did not match any version in Agent.ToolsDirectory.
```

.azure-pipelines/client.yml

@@ -41,10 +41,6 @@ jobs:
         os.name: 'Linux'
         os.vmImage: 'ubuntu-16.04'
         python.version: '2.7'
-      Linux_Python34:
-        os.name: 'Linux'
-        os.vmImage: 'ubuntu-16.04'
-        python.version: '3.4'
       Linux_Python35:
         os.name: 'Linux'
         os.vmImage: 'ubuntu-16.04'

.travis.yml

@@ -6,8 +6,6 @@ matrix:
   include:
     - os: linux
       python: "2.7"
-    - os: linux
-      python: "3.4"
     - os: linux
       python: "3.5"
     - os: linux