Added an "update all" function

Probably not really worth a whole commit

src/lib.rs

@@ -157,6 +157,13 @@ pub fn update_xmr_blockheight() {
     }
 }
 
+pub fn update_all_blockheights() {
+    update_bsv_blockheight();
+    update_btc_blockheight();
+    update_eth_blockheight();
+    update_xmr_blockheight();
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;