Reformat feature flag section of README

README.md

@@ -414,11 +414,17 @@ For more information on custom fields, see `Config::custom_field` in `micropb-ge
 ## Feature Flags
 
 - **`encode`**: Enable support for encoding and computing the size of messages. If disabled, the generator should be configured to not generate encoding logic via `Generator::encode_decode`. Enabled by default.
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 - **`decode`**: Enable support for decoding messages. If disabled, the generator should be configured to not generate decoding logic via `Generator::encode_decode`. Enabled by default.
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 - **`enable-64bit`**: Enable 64-bit integer operations. If disabled, then 64-bit fields such as `int64` or `sint64` should have `Config::int_size` set to 32 bits or less. Has no effect on `double` fields. Enabled by default.
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 - **`alloc`**: Implements container traits on `Vec`, `String`, and `BTreeMap` from [`alloc`](https://doc.rust-lang.org/alloc), allowing them to be used as container fields. Corresponds with `Generator::use_container_alloc` from `micropb-gen`. Also implements `PbWrite` on `Vec`.
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 - **`std`**: Enables standard library and the `alloc` feature.
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 - **`container-heapless`**: Implements container traits on `Vec`, `String`, and `IndexMap` from [`heapless`](https://docs.rs/heapless/latest/heapless), allowing them to be used as container fields. Corresponds with `Generator::use_container_heapless` from `micropb-gen`. Also implements `PbWrite` on `Vec`.
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 - **`container-arrayvec`**: Implements container traits on `ArrayVec` and `ArrayString` from [`arrayvec`](https://docs.rs/arrayvec/latest/arrayvec), allowing them to be used as container fields. Corresponds with `Generator::use_container_arrayvec` from `micropb-gen`. Also implements `PbWrite` on `ArrayVec`.
 
 ## MSRV