0.3.1 release

• fix #4, update minerals.h
• update example
• update keywords.txt

0.3.0 release

• Fix #14, support float indices e.g. "(Mg0.4Fe1.6)2.0SiO4" == Olivine
• update atomic_weight_formula.ino
• add minerals.h (short list)
• add atomic_weight_minerals.ino
• update / clean up constants
• add weightEV()
• add weightEV()
• add dalton2EV()
• update readme.md

0.2.2 release

• update GitHub actions
• refactor internal names for readability
• minor edits

0.2.1 release

update readme.md (#12)

- update readme.md (badges)
- fix layout .cpp

0.2.0 release

• use new weight factor 201.3868 to reduce maximum relative error
• create elements_uint16.h file.
• move ATOMIC_WEIGHT_FACTOR to elements_uint16.h file.
• create elements_name.h file with full element names. Uses ~1670 bytes of RAM.
  so will NOT work on all boards.
• add related constants
  • AVOGADRO = 6.02214076e+23; number of particles in one mole.
  • DALTON = 1.66053907e-24; weight of one nucleon in grams.
  • ELEKTRON_VOLT_JOULE = 1.602176565e-19; eV in Joule
  • ELEKTRON_VOLT_GRAM = 1.7826619e-39; eV in grams
  • DALTON_EV = 931.4940954e12 = DALTON / ELEKTRON_VOLT_GRAM
  • DALTON_JOULE = 1.036427015e5 = DALTON / ELEKTRON_VOLT_JOULE
• update unit tests.
• update readme.md
• update keywords.txt.

0.1.5 release

add conversion functions + refactor (#9)

- add **moles2grams(formula, moles)**
- add **grams2moles(formula, grams)**
- add example.
- add guarding with **size** parameter in **weight()**
- improved usage **abbrev**(name) versus **el**(index).
- improved readme.md.
- add define for **ATOMIC_WEIGHT_MAX_SPLIT_LIST**
- update keywords.txt.
- minor edits.

0.1.4 release

Develop (#8)

- add **splitElements()** split a formula in an internal list of elements.
- add **element()** access to split elements. See example.
- add **count()** to count atoms in a formula.
- add **atomPercentage()** to calculate percentage of atoms of an element.
- add examples.
- update readme.md 
- update keywords.txt
- minor edits.

0.1.3 release

add massPercentage() (#7)

* add massPercentage

0.1.2 release

extend formula parser (#5)

* extend formula parser

0.1.1 release

add weight(formula) + refactor (#3)