v0.2.0

Changes

• chore: change vscode coverage colors
• ci: remove Travis CI settings
• docs: update description of functions
• docs: update package doc overview
• fix: removed label side effect from graph and nodes
• refactor: change old pointer "constants" to proper const string
• refactor: extract Write logic of nodes and edges from graph
• refactor: proper file name casing
• refactor: rename concrete ID generator
• refactor: rename internal dot structs to *Data