typo

Signed-off-by: Gaetan Semet <gaetan@xeberon.net>

Makefile

@@ -107,7 +107,7 @@ run_frontend:
 	cd frontend ; make run
 
 kill-docker:
-	docker kill $$(docker ps --format '{{.Names}}\t{{.Image}}\t' | grep dopplerr | cut -f1)
+	docker kill $$(docker ps --format '{{.Names}}\t{{.Image}}\t' | grep dopplerr | cut -f1) || true
 
 shell:
 	@echo "Shell"

README.md

@@ -188,3 +188,7 @@ Create a release: create a tag with a Semver syntax. Optionally you can tag code
     $ git push --tags
 
 On successful travis build on the Tag branch, your Pypi package will be automatically updated.
+
+Note:
+
+> According to PBR, alpha versions are noted "x.y.z.a1"

README.rst

@@ -250,6 +250,10 @@ tag code locally and push to GitHub.
 On successful travis build on the Tag branch, your Pypi package will be
 automatically updated.
 
+Note:
+
+    According to PBR, alpha versions are noted "x.y.z.a1"
+
 .. |Build Status| image:: https://travis-ci.org/Stibbons/dopplerr.svg?branch=master
    :target: https://travis-ci.org/Stibbons/dopplerr
 .. |Docker Automated buil| image:: https://img.shields.io/docker/build/stibbons31/dopplerr.svg