update CI

.github/workflows/lint.yml

+name: Lint
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  run-linters:
+    name: Run linters
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v2
+
+      - name: Set up node
+        uses: actions/setup-node@v2
+        with:
+          node-version: 12
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Run linters
+        uses: wearerequired/lint-action@a8497ddb33fb1205941fd40452ca9fff07e0770d
+        with:
+          github_token: ${{ secrets.github_token }}
+          prettier: true
+          auto_fix: true
+          prettier_extensions: 'css,html,js,json,jsx,md,sass,scss,ts,tsx,vue,yaml,yml'

.github/workflows/CI.yml → .github/workflows/unit-tests.yml

-name: CI
-env:
-  CI: true
+name: Unit Tests
 
 on:
-  pull_request:
-    branches:
-      - v2
   push:
-    branches:
-      - v2
+  pull_request:
 
 jobs:
-  test:
+  tests:
+    name: Unit tests
     strategy:
       matrix:
         node: ['10.x', '12.x']
-        os: [ubuntu-latest, macOS-latest]
 
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v1
-      - uses: actions/setup-node@v1
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup node
+        uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
 
-      - run: npm install -g yarn
-
-      - id: yarn-cache
+      - name: Get cache directory
+        id: yarn-cache
         run: echo "::set-output name=dir::$(yarn cache dir)"
-      - uses: actions/cache@v1
+
+      - name: Cache yarn dependencies
+        uses: actions/cache@v1
         with:
           path: ${{ steps.yarn-cache.outputs.dir }}
-          key: ${{ matrix.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          key: yarn-${{ hashFiles('**/yarn.lock') }}
           restore-keys: |
-            ${{ matrix.os }}-yarn-
+            yarn-
 
-      - run: yarn
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
 
-      - run: yarn lint
-      - run: yarn build
-      - run: yarn test
+      - name: Run tests
+        run: yarn test

README.md

 # Uniswap V2 SDK
 
+
+[![Unit Tests](https://github.com/Uniswap/uniswap-v2-sdk/workflows/Unit%20Tests/badge.svg)](https://github.com/Uniswap/uniswap-v2-sdk/actions?query=workflow%3A%22Unit+Tests%22)
+[![Lint](https://github.com/Uniswap/uniswap-v2-sdk/workflows/Lint/badge.svg)](https://github.com/Uniswap/uniswap-v2-sdk/actions?query=workflow%3ALint)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
-[![Actions Status](https://github.com/Uniswap/uniswap-v2-sdk/workflows/CI/badge.svg)](https://github.com/Uniswap/uniswap-v2-sdk)
 [![npm version](https://img.shields.io/npm/v/@uniswap/v2-sdk/latest.svg)](https://www.npmjs.com/package/@uniswap/v2-sdk/v/latest)
 [![npm bundle size (scoped version)](https://img.shields.io/bundlephobia/minzip/@uniswap/v2-sdk/latest.svg)](https://bundlephobia.com/result?p=@uniswap/v2-sdk@latest)