Rename PreprocessorCacheEntry::write to serialize_to

It's more idiomatic in the Rust world, and makes it more obvious.

src/cache/disk.rs

@@ -173,7 +173,7 @@ impl Storage for DiskCache {
     ) -> Result<()> {
         let key = normalize_key(key);
         let mut buf = vec![];
-        preprocessor_cache_entry.write(&mut buf)?;
+        preprocessor_cache_entry.serialize_to(&mut buf)?;
         Ok(self
             .preprocessor_cache
             .lock()

src/compiler/preprocessor_cache.rs

@@ -77,7 +77,7 @@ impl PreprocessorCacheEntry {
     }
 
     /// Serialize the preprocessor cache entry to `buf`
-    pub fn write(&self, buf: &mut impl Write) -> Result<(), Error> {
+    pub fn serialize_to(&self, buf: &mut impl Write) -> Result<(), Error> {
         // Add the starting byte for version check since `bincode` doesn't
         // support it.
         buf.write_all(&[FORMAT_VERSION])?;