Upgrade @solidity-parser/parser to ^0.6.0 (#498)

package.json

@@ -23,7 +23,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@solidity-parser/parser": "^0.5.2",
+    "@solidity-parser/parser": "^0.6.0",
     "@truffle/provider": "^0.1.17",
     "chalk": "^2.4.2",
     "death": "^1.1.0",

yarn.lock

@@ -218,10 +218,10 @@
   resolved "https://registry.yarnpkg.com/@sindresorhus/is/-/is-0.7.0.tgz#9a06f4f137ee84d7df0460c1fdb1135ffa6c50fd"
   integrity sha512-ONhaKPIufzzrlNbqtWFFd+jlnemX6lJAgq9ZeiZtS7I1PIf/la7CW4m83rTXRnVnsMbW2k56pGYu7AUFJD9Pow==
 
-"@solidity-parser/parser@^0.5.2":
-  version "0.5.2"
-  resolved "https://registry.yarnpkg.com/@solidity-parser/parser/-/parser-0.5.2.tgz#4d74670ead39e4f4fdab605a393ba8ea2390a2c4"
-  integrity sha512-uRyvnvVYmgNmTBpWDbBsH/0kPESQhQpEc4KsvMRLVzFJ1o1s0uIv0Y6Y9IB5vI1Dwz2CbS4X/y4Wyw/75cTFnQ==
+"@solidity-parser/parser@^0.6.0":
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/@solidity-parser/parser/-/parser-0.6.0.tgz#deb964a4dbb8c21a342ee35b4acefb505fd04ea1"
+  integrity sha512-RiJXfS22frulogcfQCFhbKrd5ATu6P4tYUv/daChiIh6VHyKQ1kkVZVfX6aP7c2YGU/Bf9RwGNKdwLjfpaoqYQ==
 
 "@szmarczak/http-timer@^1.1.2":
   version "1.1.2"