Fix CI (#8)

Author: ovidiuch

.flowconfig

@@ -15,3 +15,4 @@ module.ignore_non_literal_requires=true
 module.file_ext=.js
 module.file_ext=.less
 module.name_mapper.extension='less' -> 'empty/object'
+server.max_workers=1

.travis.yml

@@ -26,3 +26,7 @@ cache:
   yarn: true
   directories:
     - /home/travis/.cypress/Cypress
+addons:
+  apt:
+    packages:
+      - libgconf-2-4

package.json

@@ -62,7 +62,7 @@
     "cpy": "^7.0.1",
     "create-react-class": "^15.6.3",
     "css-loader": "^2.1.0",
-    "cypress": "^3.1.5",
+    "cypress": "^3.8.1",
     "delay": "^4.1.0",
     "enzyme": "^3.8.0",
     "enzyme-adapter-react-16": "^1.9.1",