Test build only with the latest 3 versions of Go and vips

.circleci/config.yml

@@ -28,18 +28,6 @@ workflows:
             - checkout_code
           go_version: "1.12"
           vips_version: "8.5"
-      - build:
-          name: go1.12_vips8.4
-          requires:
-            - checkout_code
-          go_version: "1.12"
-          vips_version: "8.4"
-      - build:
-          name: go1.12_vips8.3
-          requires:
-            - checkout_code
-          go_version: "1.12"
-          vips_version: "8.3"
       - build:
           name: go1.11_vips8.7
           requires:
@@ -58,18 +46,6 @@ workflows:
             - checkout_code
           go_version: "1.11"
           vips_version: "8.5"
-      - build:
-          name: go1.11_vips8.4
-          requires:
-            - checkout_code
-          go_version: "1.11"
-          vips_version: "8.4"
-      - build:
-          name: go1.11_vips8.3
-          requires:
-            - checkout_code
-          go_version: "1.11"
-          vips_version: "8.3"
       - build:
           name: go1.10_vips8.7
           requires:
@@ -88,48 +64,6 @@ workflows:
             - checkout_code
           go_version: "1.10"
           vips_version: "8.5"
-      - build:
-          name: go1.10_vips8.4
-          requires:
-            - checkout_code
-          go_version: "1.10"
-          vips_version: "8.4"
-      - build:
-          name: go1.10_vips8.3
-          requires:
-            - checkout_code
-          go_version: "1.10"
-          vips_version: "8.3"
-      - build:
-          name: go1.10_vips8.7
-          requires:
-            - checkout_code
-          go_version: "1.9"
-          vips_version: "8.7"
-      - build:
-          name: go1.9_vips8.6
-          requires:
-            - checkout_code
-          go_version: "1.9"
-          vips_version: "8.6"
-      - build:
-          name: go1.9_vips8.5
-          requires:
-            - checkout_code
-          go_version: "1.9"
-          vips_version: "8.5"
-      - build:
-          name: go1.9_vips8.4
-          requires:
-            - checkout_code
-          go_version: "1.9"
-          vips_version: "8.4"
-      - build:
-          name: go1.9_vips8.3
-          requires:
-            - checkout_code
-          go_version: "1.9"
-          vips_version: "8.3"
 
 jobs:
   checkout_code:

docs/installation.md

@@ -46,7 +46,7 @@ $ git push heroku master
   # It's recommended to use PPA with an up to date version.
   $ sudo add-apt-repository ppa:dhor/myway
   $ sudo apt-get install libvips-dev
-  
+
   # FreeBSD
   pkg install -y pkgconf vips
   ```
@@ -56,3 +56,5 @@ $ git push heroku master
   ```bash
   $ go get -f -u github.com/DarthSim/imgproxy
   ```
+
+**Note:** imgproxy build is automatically tested with the latest three minor versions of Go and libvips. Successfully build with the older versions is not guaranteed but yet may be possible.