costerra v0.3.1

Added

• Several outputs in one run: --format takes FORMAT[:FILE] and can be
  repeated or comma-separated, e.g. --format table,markdown:costerra.md
  prints the table in the CI log and writes the MR comment to a file. At most
  one format goes to stdout (or to --out). A table written to a file has no
  colors. console is an alias of table.
• costerra completions <shell>: completion scripts for bash, zsh, fish,
  elvish, powershell, nu and xonsh. The Homebrew formula installs the bash,
  zsh and fish completions.
• Colored --help and usage errors (off with NO_COLOR).

Fixed

• costerra diff: a root module with one project per environment
  (environments/*.tfvars) was named after the temporary checkout on the
  base side (costerra-base-XXXXXX (dev)), so every environment showed as
  removed and added. The base checkout now has the same repository root as
  the head one, which also fixes get_repo_root() and the discovery of
  costerra.yml and costerra-usage.yml on the base side.
• --rightsize: when the same value is set in several module calls, the
  line in the module call of the resource is kept (module "web_proxy"),
  instead of every line with a matching entry. The note names the blocks of
  the remaining lines rather than (in ?, ?).
• --rightsize: a cost after rightsizing that rounds to zero is shown as
  $0.00, not -$0.00.
• Contract prices: when the billing account is detected but its prices are
  refused (HTTP 403), costerra now prints a single-line warning, uses list
  prices and does not ask again for 6 hours. Before, every run downloaded the
  whole price list again and printed the raw API error. The error now names
  the permission the bulk download checks (billing.billingAccountPrices.list).
• --format markdown: projects are named as in the terminal table
  (terraform (prod) rather than . (prod)), and the rightsizing section
  comes before the footer.