osu! best minor fixes (#16)

- Bump serenity version
- Now no longer pings unless the play is within top 100
- Parse numbers in bold as well
- Use relative time syntax in embeds

Cargo.lock

@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "Inflector"
 version = "0.11.4"
@@ -228,9 +230,9 @@ dependencies = [
 
 [[package]]
 name = "command_attr"
-version = "0.3.5"
+version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fe1f0b69fde68f40ea2ee6ca8db23bc40d2e593db884659a65d8486032cc65b"
+checksum = "8a6c3666f685cb1efc0628b8c984dbad9c372d080450736c7732089c385ed81d"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1485,9 +1487,9 @@ dependencies = [
 
 [[package]]
 name = "serenity"
-version = "0.10.5"
+version = "0.10.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "deead3f7ecbbbe4c249e07af17686937ccb9d7fa24ca3accd1d223e369a75272"
+checksum = "6275d443266aedf2be507a245ddc23db0c07b1b99774e16f3c879e96a78b067a"
 dependencies = [
  "async-trait",
  "async-tungstenite",