FIX: Fix C++ client get_version script

Author: threecgreen

scripts/get_version.sh

@@ -2,4 +2,6 @@
 
 SCRIPTS_DIR="$(cd "$(dirname "$0")" || exit; pwd -P)"
 PROJECT_ROOT_DIR="$(dirname "${SCRIPTS_DIR}")"
-grep '^project("databento" VERSION' "${PROJECT_ROOT_DIR}/CMakeLists.txt" | cut -d' ' -f3
+grep --after-context=2 '^project($' "${PROJECT_ROOT_DIR}/CMakeLists.txt" \
+  | grep --perl-regexp --only-matching 'VERSION \d+\.\d+\.\d+' \
+  | cut --delimiter=' ' --fields=2