v0.0.3

Use separate schema files for each collection (PR #14)
Changes to update CLI command (PR #17):
- new default behaviour:
  - attempt to use validator schema if available
  - if no validator schema then sample documents from the collection
- don't sample from collections that already have a schema
- if no --sample-size given on command line, default sample size is 10
- new option --no-validator-schema to disable attempting to use validator schema
Add any type and use it to represent mismatched types in sample documents (PR #18)

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