create reduce for asyn code example

Example: async reduce javascript

const getNonSemverPatchPRs = async () => {
    const allOpenPrs = await getAllOpenPRs();

    return allOpenPrs.reduce(async (previousPromise, pr) => {
        const collection = await previousPromise;
        const allCommits = await getAllCommitsForaPR(pr.number);

        const isNotSemverPatchPR = checkCommitMessageForPatch(allCommits[0]);
        
        if (isNotSemverPatchPR) {
            collection.push(pr);
        }

        return collection;
    }, Promise.resolve([]));
};