build: Drop Node 9 (#803)

Support for 9 dropped yesterday https://github.com/nodejs/Release/blob/bc9d936e153b9fafd7f7c203f139d02035ca6862/schedule.json#L44

Author: nschonni

.travis.yml

@@ -148,31 +148,6 @@ jobs:
         - NODE_VERSION: "8"
         - VARIANT: "stretch"
 
-    - stage: Build
-      env:
-        - NODE_VERSION: "9"
-        - VARIANT: "jessie"
-
-    - stage: Build
-      env:
-        - NODE_VERSION: "9"
-        - VARIANT: "alpine"
-
-    - stage: Build
-      env:
-        - NODE_VERSION: "9"
-        - VARIANT: "onbuild"
-
-    - stage: Build
-      env:
-        - NODE_VERSION: "9"
-        - VARIANT: "slim"
-
-    - stage: Build
-      env:
-        - NODE_VERSION: "9"
-        - VARIANT: "stretch"
-
     - stage: Build
       env:
         - NODE_VERSION: "chakracore/10"

9/alpine/Dockerfile

@@ -11,8 +11,6 @@ array_6='6 boron'
 # shellcheck disable=SC2034
 array_8='8 carbon'
 # shellcheck disable=SC2034
-array_9='9'
-# shellcheck disable=SC2034
 array_10='10 latest'
 # shellcheck disable=SC2034
 array_chakracore_8='chakracore-8'

9/jessie/Dockerfile

@@ -12,7 +12,7 @@ function usage() {
   Examples:
     - update.sh                   # Update all images
     - update.sh -s                # Update all images, skip updating Alpine and Yarn
-    - update.sh 8,9               # Update version 8 and 9 and variants (default, slim, alpine etc.)
+    - update.sh 8,10               # Update version 8 and 10 and variants (default, slim, alpine etc.)
     - update.sh -s 8              # Update version 8 and variants, skip updating Alpine and Yarn
     - update.sh 8 slim,stretch    # Update only slim and stretch variants for version 8
     - update.sh -s 8 slim,stretch # Update only slim and stretch variants for version 8, skip updating Alpine and Yarn