bump arroy version for next release

Author: irevoire

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "arroy"
 description = "Annoy-inspired Approximate Nearest Neighbors in Rust, based on LMDB and optimized for memory usage"
-version = "0.3.0"
+version = "0.3.1"
 documentation = "https://docs.rs/arroy"
 repository = "https://github.com/meilisearch/arroy"
 keywords = ["ANN-search", "Graph-algorithms", "Vector-Search", "Store"]