chore(build): add prepare script (#64)
chore(build): add prepare script (#64)

Allow this package to be installed from a git repository instead of the
npm registry. The script will run upon local "npm install".

Without a prepare script, only repository files are installed into
node_modules/moddle. Folder dist/ is missing because no build process
was executed and the package cannot be used.
bpmn-io/moddle-xml