[Tests] up to node v8.2, v7.10, v6.11; fix new npm breaking on older nodes

Author: ljharb

.travis.yml

@@ -2,8 +2,9 @@ language: node_js
 os:
  - linux
 node_js:
-  - "7.7"
-  - "6.10"
+  - "8.2"
+  - "7.10"
+  - "6.11"
   - "5.12"
   - "4.8"
   - "iojs-v3.3"
@@ -14,7 +15,7 @@ node_js:
   - "0.8"
 before_install:
   - 'if [ "${TRAVIS_NODE_VERSION}" = "0.6" ]; then npm install -g [email protected] ; elif [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then case "$(npm --version)" in 1.*) npm install -g [email protected] ;; 2.*) npm install -g npm@2 ;; esac ; fi'
-  - 'if [ "${TRAVIS_NODE_VERSION}" != "0.6" ] && [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then npm install -g npm; fi'
+  - 'if [ "${TRAVIS_NODE_VERSION}" != "0.6" ] && [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then if [ "${TRAVIS_NODE_VERSION%${TRAVIS_NODE_VERSION#[0-9]}}" = "0" ] || [ "${TRAVIS_NODE_VERSION:0:4}" = "iojs" ]; then npm install -g npm@4.5 ; else npm install -g npm; fi; fi'
 install:
   - 'if [ "${TRAVIS_NODE_VERSION}" = "0.6" ]; then nvm install 0.8 && npm install -g [email protected] && npm install -g [email protected] && npm install -g npm@2 && npm install && nvm use "${TRAVIS_NODE_VERSION}"; else npm install; fi;'
 script:
@@ -28,6 +29,16 @@ env:
 matrix:
   fast_finish: true
   include:
+    - node_js: "8.1"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "8.0"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "7.9"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "7.8"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "7.7"
+      env: TEST=true ALLOW_FAILURE=true
     - node_js: "7.6"
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "7.5"
@@ -42,6 +53,8 @@ matrix:
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "7.0"
       env: TEST=true ALLOW_FAILURE=true
+    - node_js: "6.10"
+      env: TEST=true ALLOW_FAILURE=true
     - node_js: "6.9"
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "6.8"
@@ -169,3 +182,4 @@ matrix:
   allow_failures:
     - os: osx
     - env: TEST=true ALLOW_FAILURE=true
+    - env: COVERAGE=true