fix(travis): try working around Travis + gitstats issue

See https://github.com/travis-ci/travis-ci/issues/4704#issuecomment-348435959
for the workaround

.travis/build-gitstats.sh

@@ -32,6 +32,11 @@ get_repo() {
 }
 
 make_stats() {
+    # workaround gitstats not supporting non-blocking IO correctly see
+    # https://github.com/travis-ci/travis-ci/issues/4704#issuecomment-348435959
+    python -c 'import os,sys,fcntl;\
+               flags = fcntl.fcntl(sys.stdout, fcntl.F_GETFL);\
+               fcntl.fcntl(sys.stdout, fcntl.F_SETFL, flags&~os.O_NONBLOCK);'
     gitstats \
         -c authors_top=1000 \
         -c max_authors=100000 \