style: prefer https:// links in favour of http://

[vlsi]

The following regular expression identified the deviations:

http://(?!(www\.w3|www\.apache\.org/licenses|maven\.apache\.org/(POM|xsd)))

[vlsi]

Note: the front page uses lists http:// link as well, however, I was not able to find the source for the doc

https://errorprone.info/ ->

$ bazel build :hello
ERROR: example/myproject/BUILD:29:1: Java compilation in rule '//example/myproject:hello'
ShortSet.java:6: error: [CollectionIncompatibleType] Argument 'i - 1' should not be passed to this method;
its type int is not compatible with its collection's type argument Short
      s.remove(i - 1);
              ^
    (see http://errorprone.info/bugpattern/CollectionIncompatibleType)
1 error

[tbroyer]

It's in the gh-pages branch: https://github.com/google/error-prone/blob/gh-pages/index.md