Add LICENSE to distribution

[int128]

This will fix the issue #29.

[codecov-io]

Codecov Report

Merging #30 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   84.84%   84.84%           
=======================================
  Files           1        1           
  Lines          99       99           
=======================================
  Hits           84       84           
  Misses          9        9           
  Partials        6        6

---

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[int128]

LGTM: https://circleci.com/gh/int128/kauthproxy/105

zipinfo dist/gh/kauthproxy_linux_amd64.zip
Archive:  dist/gh/kauthproxy_linux_amd64.zip
Zip file size: 17448812 bytes, number of entries: 2
-rwxr-xr-x  2.0 unx 42113616 bX defN 19-Nov-15 01:11 kauthproxy
-rw-r--r--  2.0 unx    10759 bX defN 19-Nov-15 01:10 LICENSE