fix: increase MSRV to 1.66

`unicode-width` v0.1.14 uses the `mixed_integer_ops` feature which was
stabilized in Rust version 1.66, hence also increase the MSRV of this
repo.

Also fix all Clippy warnings.

Cargo.toml

@@ -16,7 +16,7 @@ documentation = "https://docs.rs/merkletree"
 keywords = ["merkle", "merkle-tree"]
 categories = ["data-structures", "cryptography"]
 edition = "2018"
-rust-version = "1.63"
+rust-version = "1.66"
 
 [package.metadata.release]
 pre-release-commit-message = "chore(release): release {{version}}"

clippy.toml

@@ -1,3 +1,3 @@
-blacklisted-names = [
+disallowed-names = [
     "unreadable_literal"
 ]

rust-toolchain

@@ -1 +1 @@
-1.63.0
+1.66.1

src/store/disk.rs

@@ -129,7 +129,7 @@ impl<E: Element> Store<E> for DiskStore<E> {
 
     fn new_from_disk(size: usize, _branches: usize, config: &StoreConfig) -> Result<Self> {
         let data_path = StoreConfig::data_path(&config.path, &config.id);
-        Self::new_from_disk_with_path(size, &data_path)
+        Self::new_from_disk_with_path(size, data_path)
     }
 
     fn write_at(&mut self, el: E, index: usize) -> Result<()> {
@@ -494,7 +494,7 @@ impl<E: Element> DiskStore<E> {
     ) -> Result<bool> {
         let data_path = StoreConfig::data_path(&config.path, &config.id);
 
-        let file = File::open(&data_path)?;
+        let file = File::open(data_path)?;
         let metadata = file.metadata()?;
         let store_size = metadata.len() as usize;