update readme

[rsoeldner]

PR checklist:

• Test coverage for the proposed changes
• PR description contains example output from repl interaction or a snippet from unit test output
• (If Relevant) Documentation has been (manually) updated at https://docs.kadena.io/pact

Additionally, please justify why you should or should not do the following:

• Benchmark regressions
• Confirm replay/back compat (Ignore until core release)
• (For Kadena engineers) Run integration-tests against a Chainweb built with this version of Pact (Ignore until core release)

[edmundnoble]

s/Pact-5/Pact 5

[edmundnoble]

Suggested change

	Pact-5 (initially referred to Pact Core) is a comprehensive rewrite of the Pact language, focusing on enhancing scalability, maintainability, and performance in response to increasingly complex demands from users and partners.
	Pact 5 (initially referred to as Pact Core) is a comprehensive rewrite of the Pact language, focusing on enhancing scalability, maintainability, and performance in response to increasingly complex demands from users and partners.

[edmundnoble]

Suggested change

	Pact-5 maintains semantic equivalence to the original Pact implementation, with select modifications made to enhance security and performance. Existing code will continue to function as expected. Breaking modifications will be communicated using the [Kadena Improvement Process](https://github.com/kadena-io/kips) (KIP) process.
	Pact 5 maintains semantic equivalence to the original Pact implementation for the most part, with select modifications made to enhance security and performance. Existing code will mostly continue to function as expected. Breaking modifications are in <migration doc link>

[lsgunnlsgunn]

My suggestions here:
#319

Note that I didn't test the building from source code instructions. When I went through similar instructions for Chainweb node, I found they glossed over a few things.

[rsoeldner]

closing in favor of #319