Changed Amp minimum from ^2.0 -> ^2.1 for fix #243.

Bilge · Bilge · commit f936cc4ea086 · 2019-02-25T23:29:42.000Z
diff --git a/composer.json b/composer.json
@@ -13,7 +13,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "^6",
-    "amphp/amp": "^2"
+    "amphp/amp": "^2.1"
   },
   "autoload": {
     "psr-4": {
