Trying to fix Travis CI for node8; failing to load a devDependency in Web3.

.travis.yml

@@ -13,5 +13,5 @@ matrix:
   exclude:
     - node_js: "6"
       env: RUN_PHANTOMJS=1
-    - node_js: "10"
+    - node_js: "8"
       env: RUN_PHANTOMJS=1

package-lock.json

@@ -6179,9 +6179,9 @@
       "dev": true
     },
     "web3": {
-      "version": "0.20.2",
-      "resolved": "https://registry.npmjs.org/web3/-/web3-0.20.2.tgz",
-      "integrity": "sha1-xU2sX8DjdzmcBMGm7LsS5FEyeNY=",
+      "version": "0.20.6",
+      "resolved": "https://registry.npmjs.org/web3/-/web3-0.20.6.tgz",
+      "integrity": "sha1-PpcwauAk+yThCj11yIQwJWIhUSA=",
       "dev": true,
       "requires": {
         "bignumber.js": "git+https://github.com/frozeman/bignumber.js-nolookahead.git#57692b3ecfc98bbdd6b3a516cb2353652ea49934",

package.json

@@ -50,7 +50,7 @@
     "typescript": "^2.9.1",
     "vinyl-buffer": "^1.0.1",
     "vinyl-source-stream": "^2.0.0",
-    "web3": "0.20.2"
+    "web3": "0.20.6"
   },
   "browser": {
     "fs": "./tests/browser-fs.js",