1.1.0

In this release:

• server side completion filtering: this is a performance improvement for big
  list of candidates
• completion styles: exact, case-insensitive, smart-case
• cdb-json: add support for 'arguments' field,
  see https://clang.llvm.org/docs/JSONCompilationDatabase.html
• support post-completion insertion in `irony-completion-at-point'

Many thanks to all the contributors,
especially @kangjianbin for the completion performance improvements.