Merge remote-tracking branch 'origin/develop' into HEAD

docs/examples/micropayment.rst

@@ -142,8 +142,7 @@ The full contract
 ::
 
     // SPDX-License-Identifier: GPL-3.0
-    pragma solidity >0.6.99 <0.9.0;
-
+    pragma solidity >=0.7.0 <0.9.0;
     contract ReceiverPays {
         address owner = msg.sender;
 
@@ -339,8 +338,7 @@ The full contract
 ::
 
     // SPDX-License-Identifier: GPL-3.0
-    pragma solidity >0.6.99 <0.9.0;
-
+    pragma solidity >=0.7.0 <0.9.0;
     contract SimplePaymentChannel {
         address payable public sender;      // The account sending payments.
         address payable public recipient;   // The account receiving the payments.