Docs: change >0.6.99 <0.8.0 to >=0.7.0

docs/security-considerations.rst

@@ -201,7 +201,7 @@ Never use tx.origin for authorization. Let's say you have a wallet contract like
 ::
 
     // SPDX-License-Identifier: GPL-3.0
-    pragma solidity >0.6.99 <0.8.0;
+    pragma solidity >=0.7.0;
 
     // THIS CONTRACT CONTAINS A BUG - DO NOT USE
     contract TxUserWallet {
@@ -222,7 +222,7 @@ Now someone tricks you into sending Ether to the address of this attack wallet:
 ::
 
     // SPDX-License-Identifier: GPL-3.0
-    pragma solidity >0.6.99 <0.8.0;
+    pragma solidity >=0.7.0;
 
     interface TxUserWallet {
         function transferTo(address payable dest, uint amount) external;