don't use '-r' on sed

diff --git a/letsencrypt.sh b/letsencrypt.sh
index 14d42cae199eb1ab108989db8de5ca0630056ff5..7a416089c103443b3fbfc2da8d2e83dd13844946 100755 (executable)
--- a/letsencrypt.sh
+++ b/letsencrypt.sh
@@ -31,7 +31,7 @@ anti_newline() {
 
 urlbase64() {
   # urlbase64: base64 encoded string with '+' replaced with '-' and '/' replaced with '_'
-  openssl base64 -e | anti_newline | sed -r 's/=*$//g' | tr '+/' '-_'
+  openssl base64 -e | anti_newline | sed 's/=*$//g' | tr '+/' '-_'
 }
 
 hex2bin() {