Merge branch 'master' into 2.1-merge

# Conflicts:
#	.travis.yml
#	composer.json
#	src/json-rpc/src/CoreMiddleware.php

Author: limingxinleo

tests/Cases/AbstractTestCase.php

@@ -47,6 +47,7 @@ protected function getContainer($options = [])
             'db' => [
                 'default' => [
                     'driver' => $this->driver,
+                    'host' => '127.0.0.1',
                     'password' => '',
                     'database' => 'hyperf',
                     'pool' => [
@@ -56,6 +57,7 @@ protected function getContainer($options = [])
                 ],
                 'pdo' => [
                     'driver' => 'pdo',
+                    'host' => '127.0.0.1',
                     'password' => '',
                     'database' => 'hyperf',
                     'pool' => [