feat: upgrade typechain to target ethers v5

BREAKING CHANGE: upgrading to a new target ethers v5

Author: Nebulis

contracts/DocumentStore.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.5.12;
+pragma solidity ^0.5.16;
 
 import "./Ownable.sol";
 

contracts/DocumentStoreCreator.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.16;
 
 import "./UpgradableDocumentStore.sol";
 

contracts/DocumentStoreWithRevokeReasons.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.16;
 
 import "./UpgradableDocumentStore.sol";
 

contracts/Ownable.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.5.12;
+pragma solidity ^0.5.16;
 
 /**
  * @dev Contract module which provides a basic access control mechanism, where

contracts/ProxyFactory.sol

@@ -1,4 +1,4 @@
 // Importing OpenZeppelin's Proxy Factory here to build it
-pragma solidity 0.5.12;
+pragma solidity 0.5.16;
 
 import "@openzeppelin/upgrades/contracts/upgradeability/ProxyFactory.sol";

contracts/UpgradableDocumentStore.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.16;
 
 import "@openzeppelin/upgrades/contracts/Initializable.sol";
 import "@openzeppelin/contracts-ethereum-package/contracts/ownership/Ownable.sol";

package-lock.json

@@ -32,7 +32,7 @@
     "test": "npm run test:sol && npm run test:js",
     "truffle": "truffle",
     "benchmark": "truffle test ./benchmark/*",
-    "typechain": "typechain --target ethers \"build/contracts/*.json\" --outDir src/contracts",
+    "typechain": "typechain --target ethers-v5 \"build/contracts/*.json\" --outDir src/contracts",
     "postinstall": "node scripts/postInstall",
     "semantic-release": "semantic-release"
   },
@@ -54,7 +54,7 @@
     "@babel/plugin-proposal-class-properties": "^7.8.3",
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.8.3",
     "@babel/plugin-proposal-optional-chaining": "^7.8.3",
-    "@babel/preset-env": "^7.8.7",
+    "@babel/preset-env": "^7.11.0",
     "@babel/preset-typescript": "^7.8.3",
     "@babel/register": "^7.8.6",
     "@commitlint/cli": "8.2.0",
@@ -63,6 +63,7 @@
     "@ls-age/commitlint-circle": "1.0.0",
     "@openzeppelin/contracts-ethereum-package": "^2.4.0",
     "@openzeppelin/upgrades": "2.6.0",
+    "@typechain/ethers-v5": "^1.0.0",
     "@types/jest": "^25.1.4",
     "babel-eslint": "^10.1.0",
     "babel-jest": "^25.1.0",
@@ -76,7 +77,7 @@
     "eslint-plugin-chai-friendly": "^0.4.1",
     "eslint-plugin-import": "^2.20.0",
     "eslint-plugin-prettier": "^3.1.2",
-    "ethers": "^4.0.45",
+    "ethers": "^5.0.8",
     "ganache-cli": "^6.9.1",
     "git-cz": "3.2.1",
     "jest": "^25.1.0",
@@ -86,10 +87,9 @@
     "solhint": "^2.3.0",
     "solhint-plugin-prettier": "0.0.3",
     "solium": "^1.2.5",
-    "truffle": "5.1.3",
-    "typechain": "^1.0.5",
-    "typechain-target-ethers": "^1.0.4",
-    "typescript": "^3.8.3"
+    "truffle": "5.1.37",
+    "typechain": "^2.0.0",
+    "typescript": "^3.9.7"
   },
   "config": {
     "commitizen": {