Add -g argument, update changelog

CHANGELOG

@@ -17,6 +17,7 @@ CHANGELOG Roundcube Webmail
 - Added special value 'email' to login_username_filter, it changes also logon input type (#7179)
 - Upgrade to TinyMCE 5.5.1
 - Upgrade to jQuery 3.5.1 (#7464)
+- Use google-closure-compiler and yuicompressor from npm in jsshrink.sh and cssshrink.sh scripts (#7800)
 - Allow array in smtp_host config (#7296)
 - Support proxy for server-side HTTP requests (#7658)
 - By default do not set the User-Agent header (#7731)

bin/cssshrink.sh

@@ -12,7 +12,7 @@ do_shrink() {
 if which yuicompressor > /dev/null 2>&1; then
     :
 else
-    echo "yuicompressor not found. Please install e.g. 'npm install yuicompressor'."
+    echo "yuicompressor not found. Please install e.g. 'npm install -g yuicompressor'."
     exit 1
 fi
 

bin/jsshrink.sh

@@ -15,7 +15,7 @@ do_shrink() {
 if which google-closure-compiler > /dev/null 2>&1; then
     :
 else
-    echo "google-closure-compiler not found. Please install e.g. 'npm install google-closure-compiler'."
+    echo "google-closure-compiler not found. Please install e.g. 'npm install -g google-closure-compiler'."
     exit 1
 fi