Update indoc requirement from 0.3.4 to 1.0.3

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Updates the requirements on indoc to permit the latest version.

Release notes

Sourced from indoc's releases.

1.0.3

• Fix incorrect handling of strings starting with \r\n by unindent and unindent_bytes (#43)

Commits

• 663fdd6 Release 1.0.3
• a197444 Merge pull request #44 from dtolnay/cr
• 6664abc Avoid orphaning a leading carriage return
• 4bd1beb Add test of input starting with '\r\n'
• 7073755 Move unindent tests out to integration test
• 78d9109 Merge pull request 42 from SirWindfield/patch-1
• c65816a chore(readme): add MSRV badge
• 15c5345 Release 1.0.2
• b52d8a3 Merge pull request #40 from dtolnay/trim
• 4ba8410 Work around 1.45's placement of whitespace inside tokens
• Additional commits viewable in compare view

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