Add support for scraping classic Skyrim mods

Not adding it to the update.sh script quite yet since I need to run the very long process of downloading every classic skyrim mod that currently exists on the nexus first.

scripts/update.sh

@@ -3,7 +3,7 @@ if [ -f cells/edits.json ]; then
     last_update_time=$(date -r cells/edits.json +'%Y-%m-%dT%H:%M:%S')
 fi
 mkdir -p logs
-./target/release/mod-mapper &>> logs/modmapper.log
+./target/release/mod-mapper -g skyrimspecialedition &>> logs/modmapper.log
 mkdir -p cells
 mkdir -p mods
 mkdir -p files