[PATCH 2 of 3 chg-port] hgignore: ignore chg binary

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1451792488 -32400
#      Sun Jan 03 12:41:28 2016 +0900
# Node ID 723afd2311ace1ea1bacbd43d0e93a0ee6625542
# Parent  eff15ebffc6676928a785f90a7e2b669027085f5
hgignore: ignore chg binary

diff --git a/.hgignore b/.hgignore
--- a/.hgignore
+++ b/.hgignore
@@ -25,6 +25,7 @@ tests/annotated
 tests/*.err
 tests/htmlcov
 build
+contrib/chg/chg
 contrib/hgsh/hgsh
 contrib/vagrant/.vagrant
 dist