chore(build): add go 1.18 to matrix build (#166)

* chore(build): add go 1.18 to matrix build

* add 1.18

* Update README.md

* Update release.yml

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-18.04
     strategy:
       matrix:
-        go: ['1.14', '1.15', '1.16', '1.17']
+        go: ['1.15', '1.16', '1.17', '1.18']
     name: Go ${{ matrix.go }} test
     steps:
       - uses: actions/checkout@v3

README.md

@@ -52,13 +52,16 @@ For your convenience you can find the relevant standards linked below.
 
 ## Supported Go Versions
 
+For security reasons, we only support and recommend the use of one of the latest two Go versions (:white_check_mark:).  
+Versions that also build are marked with :warning:.
+
 | Version | Supported          |
 |---------|--------------------|
-| <1.13   | :x:                |
-| 1.14    | :white_check_mark: |
-| 1.15    | :white_check_mark: |
-| 1.16    | :white_check_mark: |
+| <1.15   | :x:                |
+| 1.15    | :warning:          |
+| 1.16    | :warning:          |
 | 1.17    | :white_check_mark: |
+| 1.18    | :white_check_mark: |
 
 ## Why another library