Docs: change >0.6.99 <0.8.0 to >=0.7.0

docs/examples/safe-remote.rst

@@ -26,7 +26,7 @@ you can use state machine-like constructs inside a contract.
 ::
 
     // SPDX-License-Identifier: GPL-3.0
-    pragma solidity >0.6.99 <0.8.0;
+    pragma solidity >=0.7.0;
 
     contract Purchase {
         uint public value;
@@ -143,4 +143,4 @@ you can use state machine-like constructs inside a contract.
 
             seller.transfer(3 * value);
         }
-    }
+    }