Allow React 18 as a peer dependency (#52)

* add react 18 support & update deps

* removed checks for node 14 and 16 in matrix tests

* updated react version specs in peer deps

* undo updated packages

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x]
+        node-version: [18.x, 20.x]
 
     steps:
     - uses: actions/checkout@v2
@@ -25,9 +25,9 @@ jobs:
     - run: npm run build --if-present
     - run: npm test
     - run: npm run coverage
-      if: ${{ matrix.node-version == '16.x' }} # only report coverage on latest Node
+      if: ${{ matrix.node-version == '20.x' }} # only report coverage on latest Node
     - name: Coveralls
-      if: ${{ matrix.node-version == '16.x' }} # only report coverage on latest Node
+      if: ${{ matrix.node-version == '20.x' }} # only report coverage on latest Node
       uses: coverallsapp/github-action@master
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}