Correct tests failing in master (#552)

* Executable permissions should be 755 not 775 to be saved properly in zip file.

Author: bsamuel-ui

test.js

@@ -1101,7 +1101,7 @@ test(
   async t => {
     process.chdir('tests/base');
     const path = npm(['pack', '../..']);
-    const perm = '775';
+    const perm = '755';
 
     npm(['i', path]);
     perl([
@@ -1895,7 +1895,7 @@ test(
   async t => {
     process.chdir('tests/individually');
     const path = npm(['pack', '../..']);
-    const perm = '775';
+    const perm = '755';
     writeFileSync(`module1${sep}foobar`, '');
     chmodSync(`module1${sep}foobar`, perm);
 
@@ -1934,7 +1934,7 @@ test(
   async t => {
     process.chdir('tests/individually');
     const path = npm(['pack', '../..']);
-    const perm = '775';
+    const perm = '755';
     writeFileSync(`module1${sep}foobar`, '', { mode: perm });
     chmodSync(`module1${sep}foobar`, perm);