Fixed PR builds and added permission
diff --git a/sign.sh b/sign.sh
old mode 100644
new mode 100755
index 02105c5..2f2d383
--- a/sign.sh
+++ b/sign.sh
@@ -1,5 +1,10 @@
#! /bin/bash
+if [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
+ # Don't sign PR builds.
+ exit 0
+fi
+
echo "----------Signing APK"
jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore lottie-upload-key.jks -storepass $LOTTIE_UPLOAD_CERT_KEY_STORE_PASSWORD LottieSample/build/outputs/apk/release/LottieSample-release-unsigned.apk upload -keypass $LOTTIE_UPLOAD_CERT_KEY_PASSWORD -signedjar LottieSample/build/outputs/apk/release/LottieSample-release-signed.apk
