Adding contributor into README.
Proofread and edited chapter 1. Also fixed some typos.
Updated terms in README.md
Chapter 5 80% translated. Jokes are not translated yet.
Renamed (empty) "chapter6.figures.txt"->"capítulo6.figuras.txt"
Made a very small correction to "dragón.py"
Partial translation of "es_chapter6.txt" (up to line 15)
Corrected a typo in "chapter6.txt"
Partial translation of "es_chapter6.txt" (up to line 21)
Adding folder for Dutch
Editing chapter 18.
Finished translating chapter 5. Jokes are left untranslated for now.
Merged latest upstream with Indonesian chapter 5 translation.
Partial translation of "es_chapter6.txt" (up to line 46)
Updated text content in placeholders for Spanish chapters 6 to 10, as the originals had been updated, in order to prevent someone from translating the old files (as I was about to do)
Merge https://github.com/asweigart/inventwithpython3rded
Partial translation of "es_chapter6.txt" (up to line 111)
Partial translation of "es_chapter6.txt" (up to line 160)
Partial translation of "es_chapter6.txt" (up to line 229)
Partial translation of "es_chapter6.txt" (up to line 258)
Correction of a  typo in "dragón.py"