fix deps=low

Author: nicolas-grekas

Sendgrid/composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/mailer": "^4.3.3"
+        "symfony/mailer": "^4.3.4"
     },
     "require-dev": {
         "symfony/http-client": "^4.3"

composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "egulias/email-validator": "^2.0",
+        "egulias/email-validator": "^2.1.10",
         "psr/log": "~1.0",
         "symfony/event-dispatcher": "^4.3",
         "symfony/mime": "^4.3.3"