Add additional variable for TGS conversion in sample config (#1472)

this was buried and wanted to bring it up in the config

Convert Tgs (Telegram animated sticker) images to PNG before upload.
This is useful when your bridge also contains platforms that do not support animated WebP files, like Discord.
This requires the external dependency `lottie`, which can be installed like this:
`pip install lottie cairosvg`
#874

#1173

matterbridge.toml.sample

@@ -1019,6 +1019,13 @@ QuoteFormat="{MESSAGE} (re @{QUOTENICK}: {QUOTEMESSAGE})"
 #OPTIONAL (default false)
 MediaConvertWebPToPNG=false
 
+#Convert Tgs (Telegram animated sticker) images to PNG before upload.
+#This is useful when your bridge also contains platforms that do not support animated WebP files, like Discord.
+#This requires the external dependency `lottie`, which can be installed like this:
+#`pip install lottie cairosvg`
+#https://github.com/42wim/matterbridge/issues/874
+#MediaConvertTgs="png"
+
 #Disable sending of edits to other bridges
 #OPTIONAL (default false)
 EditDisable=false