Adds uniswap and update styles

src/common/data/dapps.js

@@ -26,6 +26,15 @@ const Dapps = [
     category: Categories.EXCHANGES,
     dateAdded: '2019-04-05',
   },
+  {
+    name: 'Uniswap',
+    url: 'https://uniswap.exchange/',
+    description:
+      'Seamlessly exchange of ERC20 tokens, or use a formalized model to pooling liquidity reserves.',
+    image: '/images/dapps/uniswap.png',
+    category: Categories.EXCHANGES,
+    dateAdded: '2019-04-23',
+  },
   {
     name: 'DAI by MakerDao',
     url: 'https://dai.makerdao.com',

src/modules/Categories/Categories.module.scss

@@ -36,7 +36,7 @@
   padding: calculateRem(12);
   margin: calculateRem(4);
   cursor: pointer;
-  text-align: left;
+  text-align: -webkit-center;
   overflow: hidden;
   display: flex;
   flex-direction: column;