Replace gh with curl in GITHUB_RELEASE_TEMPLATE.md

Author: shyiko

GITHUB_RELEASE_TEMPLATE.md

@@ -4,14 +4,11 @@ REPLACE_WITH_CHANGELOG
 
 ## Installation
 
-As repo is currently private, either download manually or use [gh](https://cli.github.com/) as shown below.  
-Docker images are public.
-
 ### ice
 
 ```sh
-gh release download --repo altinity/ice REPLACE_WITH_TAG -p ice-REPLACE_WITH_VER \
-  --output ice && chmod a+x ice && sudo mv ice /usr/local/bin/
+curl -sSL https://github.com/altinity/ice/releases/download/REPLACE_WITH_TAG/ice-REPLACE_WITH_VER \
+  -o ice && chmod a+x ice && sudo mv ice /usr/local/bin/
 ```
 
 #### Docker
@@ -24,8 +21,8 @@ gh release download --repo altinity/ice REPLACE_WITH_TAG -p ice-REPLACE_WITH_VER
 ### ice-rest-catalog
 
 ```sh
-gh release download --repo altinity/ice REPLACE_WITH_TAG -p ice-rest-catalog-REPLACE_WITH_VER \
-  --output ice-rest-catalog && chmod a+x ice-rest-catalog && sudo mv ice-rest-catalog /usr/local/bin/
+curl -sSL https://github.com/altinity/ice/releases/download/REPLACE_WITH_TAG/ice-rest-catalog-REPLACE_WITH_VER \
+  -o ice-rest-catalog && chmod a+x ice-rest-catalog && sudo mv ice-rest-catalog /usr/local/bin/
 ```
 
 #### Docker