Release v0.4

What's Changed

This release uses Emscripten 3.1.41 to build the final ASM/WASM versions from libzim source v8.2.1. It is built from source code because building from the intermediate libzim.a binary leads to the broken version released in 0.3. Full-text searching is confirmed to be working in this release (0.4).

Changelog includes changes since v0.2, since the 0.3 release was broken:

• Try to compile with 3.1.41 (current latest) by @Jaifroid in #52
• Pull different EMSDK versions according to build type by @Jaifroid in #53
• Update libzim version for source build to 8.2.0 by @Jaifroid in #54
• Update libzim 8.2.1 for release 0.3 by @Jaifroid in #56
• Update prototype with v0.3 by @Jaifroid in #57 (reverted)

Full Changelog: v0.2...v0.4