Upgrade psalm to 0.3.92.

Ignore closure return types, as we need to support PHP < 7.

This is not really workable. Need to devise another way to run psalm
periodically without keeping it breaking the build.

.travis.yml

@@ -12,11 +12,12 @@ matrix:
   - php: hhvm
 before_script:
 - composer update
-- if [[ "$TRAVIS_PHP_VERSION" == "7.0" ]]; then composer require --dev vimeo/psalm:0.3.72; fi
+- if [[ "$TRAVIS_PHP_VERSION" == "7.0" ]]; then composer require --dev vimeo/psalm:0.3.92; fi
 - if [[ "$TRAVIS_PHP_VERSION" == "5.6" ]]; then composer require --dev php-coveralls/php-coveralls; fi
 script:
 - bin/check-syntax.sh
 - if [[ "$TRAVIS_PHP_VERSION" == "5.6" ]]; then php vendor/phpunit/phpunit/phpunit --configuration tools/phpunit; else php vendor/phpunit/phpunit/phpunit --configuration tools/phpunit --no-coverage; fi
+- if [[ "$TRAVIS_PHP_VERSION" == "7.0" ]]; then vendor/bin/psalm; fi
 after_success:
 - if [[ "$TRAVIS_PHP_VERSION" == "5.6" ]]; then php vendor/bin/php-coveralls -v; fi
 notifications:

psalm.xml

@@ -23,6 +23,7 @@
 
         <PropertyNotSetInConstructor errorLevel="info" />
         <MissingConstructor errorLevel="info" />
+	<MissingClosureParamType errorLevel="info" />
         <UnusedClass errorLevel="info" />
         <PossiblyUnusedMethod errorLevel="info" />
         <UntypedParam errorLevel="info" />