README.md,HACKING.md: drive-by: small Markdown style fixes

HACKING.md

@@ -185,7 +185,6 @@ Sometimes it is helpful to modify the snap version in
 `./custom-core/meta/snap.yaml` before repacking with `snap pack` so it is easy
 to identify which snap file is which.
 
-
 ### Building natively
 
 To build the `snap` command line client:
@@ -408,7 +407,6 @@ to the official list of [Ubuntu releases](https://wiki.ubuntu.com/Releases).
 > `<release-short-name>` is the first word in the release's full name, 
 e.g. for "Bionic Beaver" it is `bionic`.
 
-
 To build an Ubuntu 14.04 (Trusty Tahr) based VM, use:
 
     $ autopkgtest-buildvm-ubuntu-cloud -r trusty --post-command='sudo apt-get install -y --install-recommends linux-generic-lts-xenial && update-grub'

README.md

@@ -3,7 +3,7 @@
 # Welcome to snapd
 
 This is the code repository for **snapd**, the background service that manages
-and maintains installed snaps. 
+and maintains installed snaps.
 
 Snaps are app packages for desktop, cloud and IoT that update automatically,
 are easy to install, secure, cross-platform and dependency-free. They're being
@@ -68,8 +68,5 @@ and on [Facebook](https://www.facebook.com/snapcraftio).
 [goreportcard-image]: https://goreportcard.com/badge/github.com/snapcore/snapd
 [goreportcard-url]: https://goreportcard.com/report/github.com/snapcore/snapd
 
-[coveralls-image]: https://coveralls.io/repos/snapcore/snapd/badge.svg?branch=master&service=github
-[coveralls-url]: https://coveralls.io/github/snapcore/snapd?branch=master
-
 [codecov-url]: https://codecov.io/gh/snapcore/snapd
 [codecov-image]: https://codecov.io/gh/snapcore/snapd/branch/master/graph/badge.svg