fix: advertise NIP-13 (Proof of Work) in supportedNips (#680)

Co-authored-by: Anshuman <109489361+Anshumancanrock@users.noreply.github.com>
Co-authored-by: Ricardo Cabral <me@ricardocabral.io>

Author: 3 people

.changeset/advertise-nip-13-in-supported-nips.md

@@ -0,0 +1,5 @@
+---
+"nostream": patch
+---
+
+fix: advertise NIP-13 (Proof of Work) support in `supportedNips`

package.json

@@ -12,6 +12,7 @@
     9,
     11,
     12,
+    13,
     14,
     15,
     16,