feat: support preinstall

Closes #4

Author: dominykas

lib/index.js

@@ -103,6 +103,7 @@ exports.run = (cmd = 'install') => {
             return allowScripts[name];
         });
 
+    allowedScripts.forEach(([path, childPkg]) =>  internals.runScript('preinstall', { childPkg, path, cwd }));
     allowedScripts.forEach(([path, childPkg]) =>  internals.runScript('install', { childPkg, path, cwd }));
     allowedScripts.forEach(([path, childPkg]) =>  internals.runScript('postinstall', { childPkg, path, cwd }));
 };