Set version to .dev for the master branch

A correct version would be shown for installations from the master branch.
Bindings will be generated with a proper version as well.

re #4936
https://pulp.plan.io/issues/4936

.travis/publish_client_gem.sh

@@ -14,7 +14,7 @@ if [[ $DESCRIPTION == 'tags/'$REPORTED_VERSION ]]; then
   export VERSION=${REPORTED_VERSION}
 else
   export EPOCH="$(date +%s)"
-  export VERSION=${REPORTED_VERSION}.dev.${EPOCH}
+  export VERSION=${REPORTED_VERSION}.${EPOCH}
 fi
 
 export response=$(curl --write-out %{http_code} --silent --output /dev/null https://rubygems.org/gems/pulp_docker_client/versions/$VERSION)

pulp_docker/__init__.py

@@ -1,3 +1,3 @@
-__version__ = '4.0.0b4'
+__version__ = '4.0.0b5.dev'
 
 default_app_config = 'pulp_docker.app.PulpDockerPluginAppConfig'

setup.py

@@ -12,7 +12,7 @@
 
 setup(
     name='pulp-docker',
-    version='4.0.0b4',
+    version='4.0.0b5.dev',
     description='pulp-docker plugin for the Pulp Project',
     long_description=long_description,
     license='GPLv2+',