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

docs/examples/blind-auction.rst

@@ -24,7 +24,7 @@ to receive their money - contracts cannot activate themselves.
 
 ::
 
-    pragma solidity >=0.4.22 <0.8.0;
+    pragma solidity >=0.5.0 <0.8.0;
 
     contract SimpleAuction {
         // Parameters of the auction. Times are either

docs/examples/micropayment.rst

@@ -338,7 +338,7 @@ The full contract
 
 ::
 
-    pragma solidity >=0.4.24 <0.8.0;
+    pragma solidity >=0.5.0 <0.8.0;
 
     contract SimplePaymentChannel {
         address payable public sender;      // The account sending payments.

docs/examples/modular.rst

@@ -19,7 +19,7 @@ and the sum of all balances is an invariant across the lifetime of the contract.
 
 ::
 
-    pragma solidity >=0.4.22 <0.8.0;
+    pragma solidity >=0.5.0 <0.8.0;
 
     library Balances {
         function move(mapping(address => uint256) storage balances, address from, address to, uint amount) internal {

docs/examples/safe-remote.rst

@@ -25,7 +25,7 @@ you can use state machine-like constructs inside a contract.
 
 ::
 
-    pragma solidity >=0.4.22 <0.8.0;
+    pragma solidity >=0.5.0 <0.8.0;
 
     contract Purchase {
         uint public value;