Use solidity v0.6.10 (#84)

* Use solidity v0.6.8

* Improve test coverage

* Update .solcover.js

* Bump version

* Update sol to v0.6.10

* Remove chache files from git

* Contracts licenses

* Update package.json

* update node

* Fix compile warnings

* Update RealMath.sol

Author: ben-kaufman

.mocharc.json

@@ -0,0 +1,5 @@
+{
+    "require": ["@nomiclabs/buidler/register"],
+    "timeout": 20000,
+    "recursive": "test"
+}

.solcover.js

@@ -4,7 +4,7 @@ module.exports = {
    grep: "@skip-on-coverage", // Find everything with this tag
    invert: true               // Run the grep's inverse set.
  },
-  skipFiles: ['test/','votingMachines/IntVoteInterface.sol','token/'],
+  skipFiles: ['test/','votingMachines/IntVoteInterface.sol', ,'votingMachines/IntVoteInterfaceEvents.sol','token/'],
   providerOptions: {
     accounts: [
        {

.solhint.json

@@ -7,6 +7,7 @@
       "no-simple-event-func-name": "off",
       "two-lines-top-level-separator": "off",
       "mark-callable-contracts": "off",
-      "reason-string": "off"
+      "compiler-version": ["error","^0.6.10"],
+      "reason-string": ["error",{"maxLength":64}]
     }
   }

.travis.yml

@@ -3,7 +3,7 @@ dist: trusty
 language: node_js
 
 node_js:
-  - "12.16.1"
+  - "12.18.1"
 
 before_install:
 

buidler.config.js

@@ -123,7 +123,7 @@ module.exports = {
   }
 },
   solc: {
-    version: "0.5.17",    // Fetch exact version from solc-bin (default: truffle's version)
+    version: "0.6.10",    // Fetch exact version from solc-bin (default: truffle's version)
     optimizer: {
       enabled: true,
       runs: 200