Arthur: fix run_github_autoreply.sh

install pygithub

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I06695a8c70e07908dc1143d765c63cb432a144b9
diff --git a/ci/run_github_autoreply.sh b/ci/run_github_autoreply.sh
index dc94c76..1171c77 100755
--- a/ci/run_github_autoreply.sh
+++ b/ci/run_github_autoreply.sh
@@ -5,12 +5,7 @@
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
-# Install PyGitHub if needed
-python3 -c "import github"
-if [ $? != 0 ]
-then
-	yes | pip3 install pygithub
-fi
+yes | pip3 install pygithub
 
 # Run bot
 if [ -z "${github_issue_num}" -a -z "${github_pr_num}" ]; then