chore: Drop EOL Node 15

Author: nschonni

.github/workflows/alpine.yml

@@ -17,16 +17,13 @@ jobs:
         node:
           - 12
           - 14
-          - 15
           - 16
 
         include:
           - node: 12
             python: python2
           - node: 14
             python: python3
-          - node: 15
-            python: python3
           - node: 16
             python: python3
 

.github/workflows/linux.yml

@@ -16,7 +16,6 @@ jobs:
         node:
           - 12
           - 14
-          - 15
           - 16
 
         include:
@@ -28,10 +27,6 @@ jobs:
             gcc: "gcc-6"
             gpp: "g++-6"
             os: ubuntu-18.04
-          - node: 15
-            gcc: "gcc-6"
-            gpp: "g++-6"
-            os: ubuntu-18.04
           - node: 16
             gcc: "gcc-8"
             gpp: "g++-8"

.github/workflows/macos.yml

@@ -16,7 +16,6 @@ jobs:
         node:
           - 12
           - 14
-          - 15
           - 16
 
     steps:

.github/workflows/windows.yml

@@ -16,7 +16,6 @@ jobs:
         node:
           - 12
           - 14
-          - 15
           - 16
 
         architecture:
@@ -28,8 +27,6 @@ jobs:
             os: windows-2016
           - node: 14
             os: windows-2016
-          - node: 15
-            os: windows-2019
           - node: 16
             os: windows-2019
 

README.md

@@ -18,7 +18,7 @@ Below is a quick guide for minimum and maximum supported versions of node-sass:
 NodeJS  | Supported node-sass version | Node Module
 --------|-----------------------------|------------
 Node 16 | 6.0+                        | 93
-Node 15 | 5.0+                        | 88
+Node 15 | 5.0+, <=6.0                 | 88
 Node 14 | 4.14+                       | 83
 Node 13 | 4.13+, <5.0                 | 79
 Node 12 | 4.12+                       | 72

appveyor.yml

@@ -39,9 +39,6 @@
       - nodejs_version: 14
         GYP_MSVS_VERSION: 2017
         APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      - nodejs_version: 15
-        GYP_MSVS_VERSION: 2019
-        APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       - nodejs_version: 16
         GYP_MSVS_VERSION: 2019
         APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019