0.4.4 2021-03-09

    - Introducing Chemistry::OpenSMILES::clean_chiral_centers() to remove
      unnecessary tetrahedral chiral settings.

0.4.3 2021-01-25

    - Supporting tetrahedral chirality in
      Chemistry::OpenSMILES::Writer::write_SMILES().
    - Chiralities @TH1 and @TH2 are the same as @ and @@, respectively.
    - Specifying the requirement of Graph v0.97 or later.
    - Fixing issue with homepage.

0.4.2 2021-01-20

    - Exporting Chemistry::OpenSMILES::Writer::write_SMILES().
    - Removing chirality information from written SMILES, as code to
      write this reliably is not yet available.
    - Fixing writing of cis/trans bonds.

0.4.1 2021-01-12

    - Fixing an issue with 'scalar %hash' in t/01_atoms.t.
    - Listing a dependency on Graph::Traversal::DFS.

0.4.0 2021-01-11

    - Adding Chemistry::OpenSMILES::Writer, implementing a SMILES writer
      for the data structures built by Chemistry::OpenSMILES::Parser.
    - Converting 'charge' atom field to integer.
    - Exporting Chemistry::OpenSMILES::is_aromatic().

0.3.2 2020-10-05

    - Explicitly setting bond order to ':' on bonds between aromatic
      atoms.

0.3.1 2020-09-17

    - Establishing deterministic order while generating graph vertices
      for implicit hydrogen atoms.

0.3.0 2020-09-16

    - Deriving counts of implicit hydrogen atoms.
    - Default number of attached hydrogen atoms for atoms in square
      brackets is 0.
    - Supporting bracketless '*' atom.

0.2.1 2020-08-13

    - Adding 'number' atom field to store atom positions in the initial
      SMILES string.
    - Making 'class' atom field mandatory.
    - Making 'isotope' atom field an integer.

0.2.0 2020-05-20

    - Fixing an issue with graph merging.
    - Unifying the representation of single bonds.
    - Extending POD documentation.

0.1.3 2020-05-19

    - Detecting and reporting unbalanced parentheses.
    - Detecting and reporting unclosed ring bonds.
    - Fixing position pointers in error messages, removing line numbers.
    - Adding versioned dependency on Module::Build::Parse::Yapp v0.1.2.
    - Declaring minimum Perl version.
    - Fixing the POD.

0.1.2 2020-05-17

    - Turning hydrogen counts into real vertices. If 'raw' option is
      present, hydrogen counts are left as integers instead.

0.1.1 2020-05-14

    - Adding missing dependency on Graph::Undirected.
    - Adding POD.

0.1.0 2020-05-13

    - Initial release.