add deprecation warnings · cleder/fastkml@7901627

5:1 [truthy] truthy value should be one of [false, true]

1:1 [document-start] missing document start "---"

2:1 [truthy] truthy value should be one of [false, true]

1:1 [document-start] missing document start "---"

1:1 [truthy] truthy value should be one of [false, true]

12:1 [document-start] missing document start "---"

14:1 [truthy] truthy value should be one of [false, true]

54:101 [line-length] line too long (225 > 100 characters)

64:101 [line-length] line too long (118 > 100 characters)

67:101 [line-length] line too long (119 > 100 characters)

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