Fix requirements

.travis.yml

@@ -23,10 +23,13 @@ install:
   - wget https://phar.phpunit.de/phpcov.phar -O coverage/bin/phpcov
   - chmod +x coverage/bin/phpcov
 
+  - wget https://github.com/maglnet/ComposerRequireChecker/releases/download/2.0.0/composer-require-checker.phar
+
   - composer show
 
 script:
   - phpdbg -qrr vendor/bin/phpunit --verbose --coverage-php coverage/cov/main.cov
+  - php composer-require-checker.phar check composer.json --config-file $PWD/composer-require-check.json
   - PHP_CS_FIXER_IGNORE_ENV=1 php vendor/bin/php-cs-fixer --diff --dry-run -v fix
 
 after_script:

composer-require-check.json

@@ -0,0 +1,32 @@
+{
+    "symbol-whitelist": [
+        "null",
+        "true",
+        "false",
+        "static",
+        "self",
+        "parent",
+        "array",
+        "string",
+        "int",
+        "float",
+        "bool",
+        "iterable",
+        "callable",
+        "void",
+        "object",
+        "parseDeltaSeconds",
+        "now",
+        "parseCacheControlHeader",
+        "parseDateHeader"
+    ],
+    "php-core-extensions": [
+        "Core",
+        "date",
+        "pcre",
+        "Phar",
+        "Reflection",
+        "SPL",
+        "standard"
+    ]
+}

composer.json

@@ -6,12 +6,14 @@
         "php": ">=7.2",
         "ext-json": "*",
         "ext-filter": "*",
+        "ext-hash": "*",
         "amphp/amp": "^2.4",
         "amphp/http": "^1.5",
         "amphp/http-client": "^4",
         "amphp/cache": "^1.3",
         "psr/log": "^1.1",
-        "kelunik/string": "^1.0"
+        "kelunik/string": "^1.0",
+        "amphp/byte-stream": "^1.7"
     },
     "require-dev": {
         "phpunit/phpunit": "^8 | ^7",

src/Internal/CachedResponse.php

@@ -7,7 +7,6 @@
 use Amp\Http\Client\Request;
 use Amp\Http\Client\Response;
 use Amp\Http\Message;
-use function Amp\Http\Client\Cache\isFresh;
 use function Amp\Http\Client\Cache\now;
 use function Amp\Http\Client\Cache\parseCacheControlHeader;
 use function Amp\Http\Client\Cache\parseDateHeader;