Release 1.5

What's Changed

• [main < readme_update] Updated git clone to git clone --recurse-submodules by @niko4299 in #176
• Make Graph Coloring output vertices and integers instead of strings by @brunos252 in #177
• [main < T307] Add graph util module by @Josipmrden in #180
• Set up MAGE for 1.5 release by @antepusic in #184
• [T316 > master] Add graph utility of chain nodes function by @Josipmrden in #185
• Update test badge in README by @katarinasupe in #188

Full Changelog: v1.4...v1.5