v0.4.0

Quantics v0.4.0

Diff since v0.3.9

Merged pull requests:

• Use ITensors v0.7 (Drop support for old ITensors <= v0.6) (#18) (@terasakisatoshi)
• Update CI.yml: use lts rather than 1.9 (#19) (@terasakisatoshi)
• Fix permissions in CI.yml (#20) (@terasakisatoshi)
• Bump to v0.4.0 (#21) (@terasakisatoshi)