chore: update to solidity 0.7.4

.nvmrc

@@ -1 +1 @@
-10
+12

.travis.yml

@@ -1,18 +1,15 @@
-dist: trusty
+os: linux
+dist: xenial
 group: beta
 language: node_js
 node_js:
-  - "10"
+  - "12"
 
-# for some reason caching fails build
 cache:
   directories:
     - node_modules
 
 jobs:
-  # XXX fast_finish doesn't work with stages yet. See
-  # https://github.com/travis-ci/travis-ci/issues/8425
-  # --elopio - 20180531
   fast_finish: true
   allow_failures:
     - env: SOLC_NIGHTLY=true

buidler.config.js

@@ -13,7 +13,7 @@ module.exports = {
     },
   },
   solc: {
-    version: '0.7.1',
+    version: '0.7.4',
     optimizer: {
       enabled: true,
       runs: 200,

package.json

@@ -1,6 +1,6 @@
 {
   "name": "erc-payable-token",
-  "version": "3.2.0",
+  "version": "3.2.1",
   "description": "ERC-1363 Payable Token Implementation",
   "files": [
     "contracts",
@@ -43,32 +43,28 @@
   },
   "homepage": "https://vittominacori.github.io/erc1363-payable-token",
   "dependencies": {
-    "@openzeppelin/contracts": "3.2.0-solc-0.7"
+    "@openzeppelin/contracts": "3.2.1-solc-0.7"
   },
   "devDependencies": {
-    "@nomiclabs/buidler": "^1.4.5",
+    "@nomiclabs/buidler": "^1.4.8",
     "@nomiclabs/buidler-ganache": "^1.3.3",
     "@nomiclabs/buidler-truffle5": "^1.3.4",
     "@nomiclabs/buidler-web3": "^1.3.4",
-    "@openzeppelin/test-helpers": "^0.5.6",
-    "@vuepress/plugin-google-analytics": "^1.5.4",
+    "@openzeppelin/test-helpers": "^0.5.7",
+    "@vuepress/plugin-google-analytics": "^1.7.1",
     "chai": "^4.2.0",
     "coveralls": "^3.1.0",
-    "eslint": "^7.8.1",
-    "eslint-config-standard": "^14.1.1",
-    "eslint-plugin-import": "^2.22.0",
+    "eslint": "^7.11.0",
+    "eslint-config-standard": "^15.0.0",
+    "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-mocha-no-only": "^1.1.1",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^4.2.1",
-    "eslint-plugin-standard": "^4.0.1",
-    "ethereumjs-util": "^7.0.5",
-    "ethjs-abi": "^0.2.1",
-    "ganache-cli": "^6.10.2",
-    "pify": "^5.0.0",
-    "solhint": "^3.2.0",
-    "solidity-coverage": "^0.7.10",
-    "truffle": "5.1.44",
-    "vuepress": "^1.5.4",
-    "web3": "^1.2.11"
+    "eslint-plugin-standard": "^4.0.2",
+    "ganache-cli": "^6.12.0",
+    "solhint": "^3.2.2",
+    "solidity-coverage": "^0.7.11",
+    "truffle": "^5.1.49",
+    "vuepress": "^1.7.1"
   }
 }

truffle-config.js

@@ -1,7 +1,7 @@
 require('chai/register-should');
 
 const solcStable = {
-  version: '0.7.1',
+  version: '0.7.4',
   settings: {
     optimizer: {
       enabled: true,