Changed CI to create release note for patches

This is a result of feedback that the current release notes made it too
difficult to see what changes happened on patch releases. From my
experience as well it became difficult to chase down which release a
commit landed on.

The risk is that this creates additional noise, both for the release
page and for user notifications. I am open to feedback if this causes a
problem.

Other tweaks on the CI side, these came from iteration with the same
scheme for coru and equeue:

- Changed version branch updates to be atomic (vN and vN-prefix). This
  makes it a bit easier to fix if one of the pushes fails due to a rogue
  branch with the same name.

- Added GEKY_BOT_DRAFT as a CI macro that can optionally switch between
  only creating drafts or immediately posting a release. The default is
  what I will be trying with littlefs which is to draft minor/major
  releases, but automatically create patch release.

  The real benefit of automatic releases is to use on tiny repos that
  don't really have an active maintainer. Though this is definitely no
  longer the case with littlefs, and I'm happy it has gained this much
  attention.

.travis.yml

@@ -248,34 +248,30 @@ jobs:
                   -m "Generated v$LFS_VERSION_MAJOR prefixes")
           git reset --hard
           # Update major version branches (vN and vN-prefix)
-          git push https://$GEKY_BOT_RELEASES@github.com/$TRAVIS_REPO_SLUG.git \
+          git push --atomic https://$GEKY_BOT_RELEASES@github.com/$TRAVIS_REPO_SLUG.git \
               v$LFS_VERSION_MAJOR \
               v$LFS_VERSION_MAJOR-prefix
-          # Create patch version tag (vN.N.N)
-          curl -f -u "$GEKY_BOT_RELEASES" -X POST \
-              https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs \
-              -d "{
-                  \"ref\": \"refs/tags/$LFS_VERSION\",
-                  \"sha\": \"$TRAVIS_COMMIT\"
-              }"
-          # Create minor release?
-          [[ "$LFS_VERSION" == *.0 ]] || exit 0
           # Build release notes
-          PREV=$(git tag --sort=-v:refname -l "v*.0" | head -1)
+          PREV=$(git tag --sort=-v:refname -l "v*" | head -1)
           if [ ! -z "$PREV" ]
           then
               echo "PREV $PREV"
-              CHANGES=$'### Changes\n\n'$( \
+              CHANGES=$(git log --oneline $PREV.. --grep='^Merge' --invert-grep)
-                  git log --oneline $PREV.. --grep='^Merge' --invert-grep)
               printf "CHANGES\n%s\n\n" "$CHANGES"
           fi
-          # Create the release
+          case ${GEKY_BOT_DRAFT:-minor} in
+              true)  DRAFT=true ;;
+              minor) DRAFT=$(jq -R 'endswith(".0")' <<< "$LFS_VERSION") ;;
+              false) DRAFT=false ;;
+          esac
+          # Create the release and patch version tag (vN.N.N)
           curl -f -u "$GEKY_BOT_RELEASES" -X POST \
               https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases \
               -d "{
                   \"tag_name\": \"$LFS_VERSION\",
                   \"name\": \"${LFS_VERSION%.0}\",
-                  \"draft\": true,
+                  \"target_commitish\": \"$TRAVIS_COMMIT\",
+                  \"draft\": $DRAFT,
                   \"body\": $(jq -sR '.' <<< "$CHANGES")
               }" #"
           SCRIPT