Merge branch 'master' of https://github.com/apache/incubator-skywalking-website

# Conflicts:
#	docs/downloads/README.md
#	docs/events/README.md
#	docs/zh/downloads/README.md
#	docs/zh/events/README.md
tree: 4eeca74b17087044f592918765a4f368a4575f9c
  1. docs/
  2. .gitignore
  3. .travis.yml
  4. package-lock.json
  5. package.json
  6. README.md