Update log to 0.4.14

This avoids the following warning:

```
warning: trailing semicolon in macro used in expression position
   --> /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/log-0.4.11/src/macros.rs:152:45
    |
147 | / macro_rules! debug {
148 | |     (target: $target:expr, $($arg:tt)+) => (
149 | |         log!(target: $target, $crate::Level::Debug, $($arg)+);
150 | |     );
151 | |     ($($arg:tt)+) => (
152 | |         log!($crate::Level::Debug, $($arg)+);
    | |                                             ^
153 | |     )
154 | | }
    | |_- in this expansion of `debug!`
    |
   ::: src/tools/rustfmt/src/modules/visitor.rs:36:23
    |
36  |               Err(e) => debug!("{}", e),
    |                         --------------- in this macro invocation
    |
    = note: requested on the command line with `-W semicolon-in-expressions-from-macros`
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue rust-lang#79813 <rust-lang#79813>
```

Cargo.toml

@@ -42,7 +42,7 @@ unicode-segmentation = "1.0.0"
 regex = "1.0"
 term = "0.6"
 diff = "0.1"
-log = "0.4"
+log = "0.4.14"
 env_logger = "0.6"
 getopts = "0.2"
 derive-new = "0.5"