Update README with migration and performance details

Author: blueyetisoftware

README.md

@@ -30,7 +30,7 @@ This is a heavily adapted fork of the excellent [somesocks/lua-lockbox](https://
 Upstream lua-lockbox is a fantastic general-purpose reference, but has seen low activity and is seeking new maintainers.
 
 ### Quick usage in an Edge driver
-
+Migration from lua-lockbox is a drop in other than replacing lockbox with crypto. The API remains compatible.
 ```lua
 local Crypto = require "crypto"
 
@@ -59,7 +59,7 @@ local mac = hmac()
 |---------------------------------|--------------------------------------------|---------------------------------------------------|
 | **Performance**                 | **External bit library overhead**          | **Native bitwise operators** (8.5% faster avg)    |
 | Lua version                     | Broad compat (5.1+ with fallbacks)         | ≥ 5.3 (native bitwise, integers)                  |
-| Bitwise operations              | Dynamic require (bit/bit32/numberlua)      | Native `& | ~ << >>` operators                        |
+| Bitwise operations              | Dynamic require (bit/bit32/numberlua)      | Native operators                        |
 | Rotations                       | Polyfill / compatibility layer             | Native shift + 32-bit mask                        |
 | CI                              | Travis                                     | GitHub Actions + direct Lua 5.3 testing           |
 | Test suite                      | Original RFC vectors + edge cases          | Fixed vectors, pruned problematic tests, large-data added |
@@ -75,4 +75,4 @@ If this library saves you time on your Edge driver, consider sponsoring developm
 MIT (same as upstream)
 
 Original Implementation © 2015–2024 somesocks
-Adaptations & SmartThings Edge Optimizations © 2022–2026 blueyetisoftware (BlueYeti Software Inc.)
+Adaptations & SmartThings Edge Optimizations © 2022–2026 blueyetisoftware (BlueYeti Software Inc.)