remove color feature

.github/workflows/rust.yml

@@ -56,7 +56,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.43
+          toolchain: 1.54
           override: true
       - uses: Swatinem/rust-cache@v1
       - uses: actions-rs/cargo@v1

Cargo.toml

@@ -10,16 +10,11 @@ documentation = "https://docs.rs/php-literal-parser"
 
 [dependencies]
 logos = "0.12"
-thiserror = "1.0"
-memchr = "2.3.4"
-serde = "1.0"
-miette = { version = "1" }
+thiserror = "1"
+memchr = "2"
+serde = "1"
+miette = "1"
 
 [dev-dependencies]
-maplit = "1.0.2"
-serde_derive = "1.0"
-main_error = "0.1"
-
-[features]
-default = ["colors"]
-colors = ["source-span/colors"]
+maplit = "1"
+serde_derive = "1"