A section that is indented is parsed as key

affected version: `0.21.2` not affected: `0.21.1` This example has all lines beginning with spaces: ``` [SectionA] Key1=Value1 [SectionB] Key2=Value2 ``` with version 0.21.1 it is correctly parsed (default parse options): ``` Ini { sections: { None: Properties { data: {}, }, Some( "SectionA", ): Properties { data: { "Key1": "Value1", }, }, Some( "SectionB", ): Properties { data: { "Key2": "Value2", }, }, }, } ``` however with version 0.21.2, `[SectionB]` is parsed as part of the next key: ``` Ini { sections: { None: Properties { data: {}, }, Some( "SectionA", ): Properties { data: { "Key1": "Value1", "[SectionB]\n Key2": "Value2", }, }, }, } ```