deps: bump it-merge from 2.0.1 to 3.0.0 (#51)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -149,7 +149,7 @@
     "it-first": "^2.0.0",
     "it-handshake": "^4.1.2",
     "it-length-prefixed": "^8.0.3",
-    "it-merge": "^2.0.0",
+    "it-merge": "^3.0.0",
     "it-pipe": "^2.0.4",
     "it-pushable": "^3.1.0",
     "it-reader": "^6.0.1",