ci: remove shallow submodule cloning

Author: felixfbecker

.gitmodules

@@ -1,36 +1,27 @@
 [submodule "validation/frameworks/php-language-server"]
 	path = validation/frameworks/php-language-server
 	url = https://github.com/felixfbecker/php-language-server
-	shallow = true
 [submodule "validation/frameworks/wordpress"]
 	path = validation/frameworks/wordpress
 	url = https://github.com/wordpress/wordpress
-	shallow = true
 [submodule "validation/frameworks/drupal"]
 	path = validation/frameworks/drupal
 	url = https://github.com/drupal/drupal
-	shallow = true
 [submodule "validation/frameworks/tolerant-php-parser"]
 	path = validation/frameworks/tolerant-php-parser
 	url = https://github.com/microsoft/tolerant-php-parser
-	shallow = true
 [submodule "validation/frameworks/symfony"]
 	path = validation/frameworks/symfony
 	url = https://github.com/symfony/symfony
-	shallow = true
 [submodule "validation/frameworks/math-php"]
 	path = validation/frameworks/math-php
 	url = https://github.com/markrogoyski/math-php
-	shallow = true
 [submodule "validation/frameworks/codeigniter"]
 	path = validation/frameworks/codeigniter
 	url = https://github.com/bcit-ci/codeigniter
-	shallow = true
 [submodule "validation/frameworks/cakephp"]
 	path = validation/frameworks/cakephp
 	url = https://github.com/cakephp/cakephp
-	shallow = true
 [submodule "validation/frameworks/phpunit"]
 	path = validation/frameworks/phpunit
 	url = https://github.com/sebastianbergmann/phpunit
-	shallow = true

.travis.yml

@@ -6,6 +6,7 @@ php:
   - 7.2
 
 git:
+  depth: 10
   submodules: false
 
 services: