[Tests] up to node v12.7, v11.15, v10.16, v8.16, v6.17; use nvm install-latest-npm

Author: ljharb

.travis.yml

@@ -2,12 +2,13 @@ language: node_js
 os:
  - linux
 node_js:
-  - "11.6"
-  - "10.15"
+  - "12.7"
+  - "11.15"
+  - "10.16"
   - "9.11"
-  - "8.15"
+  - "8.16"
   - "7.10"
-  - "6.16"
+  - "6.17"
   - "5.12"
   - "4.9"
   - "iojs-v3.3"
@@ -36,6 +37,38 @@ matrix:
       env: PRETEST=true
     - node_js: "lts/*"
       env: POSTTEST=true
+    - node_js: "12.6"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "12.5"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "12.4"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "12.3"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "12.2"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "12.1"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "12.0"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "11.14"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "11.13"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "11.12"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "11.11"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "11.10"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "11.9"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "11.8"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "11.7"
+      env: TEST=true ALLOW_FAILURE=true
+    - node_js: "11.6"
+      env: TEST=true ALLOW_FAILURE=true
     - node_js: "11.5"
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "11.4"
@@ -48,6 +81,8 @@ matrix:
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "11.0"
       env: TEST=true ALLOW_FAILURE=true
+    - node_js: "10.15"
+      env: TEST=true ALLOW_FAILURE=true
     - node_js: "10.14"
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "10.13"
@@ -100,6 +135,8 @@ matrix:
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "9.0"
       env: TEST=true ALLOW_FAILURE=true
+    - node_js: "8.15"
+      env: TEST=true ALLOW_FAILURE=true
     - node_js: "8.14"
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "8.13"
@@ -150,6 +187,8 @@ matrix:
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "7.0"
       env: TEST=true ALLOW_FAILURE=true
+    - node_js: "6.16"
+      env: TEST=true ALLOW_FAILURE=true
     - node_js: "6.15"
       env: TEST=true ALLOW_FAILURE=true
     - node_js: "6.14"