fix(session): fixed concurrency of streams within sessions

Having multiple fetch requests to the same host caused them to be requested sequencially due to a
concurrency bug in the underlying concurrency library 'already' which is now fixed.

fixes #39, fixes #77 and fixes #85

lib/context.ts

@@ -396,13 +396,15 @@ export class Context
 		{
 			if ( cacheItem.protocol === "https1" )
 			{
+				shortcut( );
 				const resp = await tryWaitForHttp1( cacheItem.session );
 				if ( resp )
 					return resp;
 			}
 			else if ( cacheItem.protocol === "https2" )
 			{
 				cacheItem.session.ref( );
+				shortcut( );
 				return doFetchHttp2( cacheItem.session );
 			}
 		}

package.json

@@ -71,7 +71,7 @@
   },
   "dependencies": {
     "@types/tough-cookie": "^2.3.6",
-    "already": "^1.11.1",
+    "already": "^1.12.0",
     "callguard": "^1.2.1",
     "get-stream": "^5.1.0",
     "through2": "^3.0.1",