chore(release): 1.2.0 (#30)

Bump 1.1.4 -> 1.2.0 across all release files (Cargo, pyproject, wasm,
conda, docs) and roll the CHANGELOG [Unreleased] section into [1.2.0].

Highlights: runtime CPU-feature dispatch (multiversion), broader wheel
coverage (linux aarch64 + musllinux + windows arm64), abi3 wheels,
Dynamic Time Warping, and indicator-specific exception types.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "ferro-ta"
-version = "1.1.4"
+version = "1.2.0"
 description = "Rust-powered Python technical analysis library with a TA-Lib-compatible API"
 readme = "README.md"
 license = { text = "MIT" }