remove contributing requirement

Author: jdaugherty

etc/bin/verify-source-distribution.sh

@@ -78,7 +78,7 @@ if [ ! -d "${SRC_DIR}" ]; then
 fi
 
 echo "Checking for required files existence..."
-REQUIRED_FILES=("LICENSE" "NOTICE" "README.md" "CONTRIBUTING.md" "PUBLISHED_ARTIFACTS" "CHECKSUMS" "BUILD_DATE" "DISCLAIMER")
+REQUIRED_FILES=("LICENSE" "NOTICE" "README.md" "PUBLISHED_ARTIFACTS" "CHECKSUMS" "BUILD_DATE" "DISCLAIMER")
 
 for FILE in "${REQUIRED_FILES[@]}"; do
   if [ ! -f "${SRC_DIR}/$FILE" ]; then