Update README with new installation command and note for older versions (#3)

* Update README with new installation command and note for older versions

Update the installation command and tests to use `ddev add-on get` instead of `ddev get`.

* **README.md**
  - Update the installation command to use `ddev add-on get Morgy93/ddev-deno`.
  - Add a note for older versions to use `ddev get` instead of `ddev add-on get`.

* **tests/test.bats**
  - Update the test cases to use `ddev add-on get` instead of `ddev get`.

* Update README to format note for older DDEV versions

---------

Co-authored-by: Thomas Hauschild <[email protected]>

Author: dermatz

README.md

@@ -28,10 +28,13 @@ YouTube: [What is Deno?](https://www.youtube.com/watch?v=KPTOo4k8-GE)
 ## Installation
 
 ```shell
-ddev get Morgy93/ddev-deno
+ddev add-on get Morgy93/ddev-deno
 ddev restart
 ```
 
+> [!NOTE]
+> For older versions of DDEV (prior to v1.23.5), use `ddev get` instead of `ddev add-on get`.
+
 ## Usage
 
 ```shell

tests/test.bats

@@ -26,18 +26,17 @@ teardown() {
 @test "install from directory" {
   set -eu -o pipefail
   cd ${TESTDIR}
-  echo "# ddev get ${DIR} with project ${PROJNAME} in ${TESTDIR} ($(pwd))" >&3
-  ddev get ${DIR}
+  echo "# ddev add-on get ${DIR} with project ${PROJNAME} in ${TESTDIR} ($(pwd))" >&3
+  ddev add-on get ${DIR}
   ddev restart
   health_checks
 }
 
 @test "install from release" {
   set -eu -o pipefail
   cd ${TESTDIR} || ( printf "unable to cd to ${TESTDIR}\n" && exit 1 )
-  echo "# ddev get ${DDEV_ADDON} with project ${PROJNAME} in ${TESTDIR} ($(pwd))" >&3
-  ddev get ${DDEV_ADDON}
+  echo "# ddev add-on get ${DDEV_ADDON} with project ${PROJNAME} in ${TESTDIR} ($(pwd))" >&3
+  ddev add-on get ${DDEV_ADDON}
   ddev restart >/dev/null
   health_checks
 }
-