style: use the max-len solidity rule (#944)

contracts/mocks/DetailedERC20Mock.sol

@@ -5,5 +5,12 @@ import "../token/ERC20/DetailedERC20.sol";
 
 
 contract DetailedERC20Mock is StandardToken, DetailedERC20 {
-  constructor(string _name, string _symbol, uint8 _decimals) DetailedERC20(_name, _symbol, _decimals) public {}
+  constructor(
+    string _name,
+    string _symbol,
+    uint8 _decimals
+  )
+    DetailedERC20(_name, _symbol, _decimals)
+    public
+  {}
 }

contracts/mocks/ERC721ReceiverMock.sol

@@ -7,7 +7,12 @@ contract ERC721ReceiverMock is ERC721Receiver {
   bytes4 retval;
   bool reverts;
 
-  event Received(address _address, uint256 _tokenId, bytes _data, uint256 _gas);
+  event Received(
+    address _address,
+    uint256 _tokenId,
+    bytes _data,
+    uint256 _gas
+  );
 
   constructor(bytes4 _retval, bool _reverts) public {
     retval = _retval;

contracts/mocks/MerkleProofWrapper.sol

@@ -5,7 +5,15 @@ import { MerkleProof } from "../MerkleProof.sol";
 
 contract MerkleProofWrapper {
 
-  function verifyProof(bytes32[] _proof, bytes32 _root, bytes32 _leaf) public pure returns (bool) {
+  function verifyProof(
+    bytes32[] _proof,
+    bytes32 _root,
+    bytes32 _leaf
+  )
+    public
+    pure
+    returns (bool)
+  {
     return MerkleProof.verifyProof(_proof, _root, _leaf);
   }
 }

contracts/mocks/MessageHelper.sol

@@ -6,12 +6,27 @@ contract MessageHelper {
   event Show(bytes32 b32, uint256 number, string text);
   event Buy(bytes32 b32, uint256 number, string text, uint256 value);
 
-  function showMessage( bytes32 message, uint256 number, string text ) public returns (bool) {
+  function showMessage(
+    bytes32 message,
+    uint256 number,
+    string text
+  )
+    public
+    returns (bool)
+  {
     emit Show(message, number, text);
     return true;
   }
 
-  function buyMessage( bytes32 message, uint256 number, string text ) public payable returns (bool) {
+  function buyMessage(
+    bytes32 message,
+    uint256 number,
+    string text
+  )
+    public
+    payable
+    returns (bool)
+  {
     emit Buy(
       message,
       number,