Apply upstream tree_magic_mini patch to fix blank line crash

Fixes #378

CHANGELOG.md

@@ -7,6 +7,9 @@ better results when difftastic doesn't fully support the syntax
 (e.g. PostCSS is a superset of CSS) or when there are actual syntax
 errors.
 
+Fixed a crash on file content detection when the local MIME database
+contains blank lines.
+
 ### Display
 
 Line numbers styling has been tweaked to make it more visually

Cargo.lock

@@ -637,9 +637,8 @@ dependencies = [
 
 [[package]]
 name = "tree_magic_mini"
-version = "3.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91adfd0607cacf6e4babdb870e9bec4037c1c4b151cfd279ccefc5e0c7feaa6d"
+version = "3.0.2"
+source = "git+https://github.com/Wilfred/tree_magic?branch=fix-panic-for-empty-strings#13dd6dda15c7062bd8f7dd5bc9bb5b16ce9ee613"
 dependencies = [
  "bytecount",
  "fnv",

Cargo.toml

@@ -44,7 +44,7 @@ const_format = "0.2.22"
 owo-colors = "3.3.0"
 wu-diff = "0.1.2"
 rayon = "1.5.2"
-tree_magic_mini = "3.0.3"
+tree_magic_mini = "3.0.2"
 bumpalo = "3.9.1"
 unicode-width = "0.1.9"
 term_size = "0.3.2"
@@ -65,3 +65,7 @@ name = "difft"
 path = "src/main.rs"
 
 [features]
+
+[patch.crates-io]
+# https://github.com/mbrubeck/tree_magic/pull/13 hasn't been merged yet.
+tree_magic_mini = { git = 'https://github.com/Wilfred/tree_magic', branch = 'fix-panic-for-empty-strings' }