Ignore composer.lock. (#295)

Co-authored-by: Gabriel Anca Corral <GabrielAnca@users.noreply.github.com>

Author: lucasmichot

.gitignore

@@ -5,6 +5,7 @@
 .idea
 
 # Composer
+composer.lock
 composer.phar
 /vendor
 
@@ -14,4 +15,4 @@ phpunit.phar
 
 # Extras
 build/
-*.swp
+*.swp