Merge branch 'mega-remove' into 'master'

remove merchant 'megachange'

Closes #882

See merge request monero-project/monero-site!901

_data/merchants.yml

@@ -59,8 +59,6 @@
       url: https://localmonero.co/
     - name: Magnetic Exchange
       url: https://magneticexchange.com
-    - name: MegaChange.is (P2P exchange)
-      url: https://megachange.is
     - name: MoneroDirect (Euro only)
       url: https://monerodirect.com
     - name: Poloniex