feat: Add itch.io as possible platform

Cargo.lock

@@ -200,6 +200,18 @@ version = "0.4.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "82cf52a69f51e16cffda2993f68b33a0fafd0d664163f87fa80e5e4fec2fc232"
 
+[[package]]
+name = "flate2"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e6988e897c1c9c485f43b47a529cef42fde0547f9d8d41a7062518f1d8fc53f"
+dependencies = [
+ "cfg-if",
+ "crc32fast",
+ "libc",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "fltk"
 version = "1.2.3"
@@ -1091,6 +1103,7 @@ dependencies = [
  "config",
  "failure",
  "fl2rust",
+ "flate2",
  "fltk",
  "nom 7.0.0",
  "nom_locate",