add merchant 'thoughtlab'

_data/merchants.yml

@@ -224,6 +224,8 @@
       url: https://rootbox.host/
     - name: TheBigCoin - Spend Monero Anywhere
       url: https://www.thebigcoin.io
+    - name: ThoughtLab - web design, development, and digital marketing
+      url: https://www.thoughtlab.com/
     - name: TorGuard - VPN, proxy and email service
       url: https://torguard.net
     - name: Tuxcon Hosting - Mail and Web Hosting