Creating Pull Requests in batch

Prerequisites

Script

Make a script make-prs.sh with following content

#!/bin/bash

# ORGANIZATION GITHUB URL
ORG=itpp-labs
UPSTREAM_URL_GIT=https://github.com/$ORG

# DEVELOPER INFO
USERNAME=yelizariev

# WHERE TO CLONE
DIRECTORY_CLONE=$(pwd)

# DESCRIPTION OF THE UPDATES
MSG=":shield: travis.yml notifications webhook travis"
BRANCH_SUFFIX=travis-notifications

REPOS=(
    misc-addons
    pos-addons
    access-addons
    mail-addons
    website-addons
    sync-addons
    )
BRANCHES=(
    10.0
    11.0
    12.0
    )

for REPO in "${REPOS[@]}"; do
    if [ ! -d $DIRECTORY_CLONE/$REPO ]
    then
        git clone $UPSTREAM_URL_GIT/$REPO.git $DIRECTORY_CLONE/$REPO
        cd $DIRECTORY_CLONE/$REPO
        git remote rename origin upstream
        git remote add origin git@github.com:$USERNAME/$REPO.git
    fi
    cd $DIRECTORY_CLONE/$REPO
    for BRANCH in "${BRANCHES[@]}"; do
        git fetch upstream $BRANCH
        git checkout -b $BRANCH-$BRANCH_SUFFIX upstream/$BRANCH

        # CHECK THAT UPDATES ARE NOT DONE YET
        if grep -qx '    on_failure: change' .travis.yml
        then
            echo "File are already updated in $REPO#$BRANCH"
        else
            # MAKE UPDATE
            { echo '  webhooks:'; echo '    on_failure: change'; echo '  urls:'; echo '    - "https://ci.it-projects.info/travis/on_failure/change"';} >> ./.travis.yml
        fi
        git commit -a -m "$MSG"
        git push origin $BRANCH-$BRANCH_SUFFIX
        hub pull-request -b $ORG:$BRANCH -m "$MSG"
    done
done

Update script according to you needs

Run it with bash make-prs.sh