0.0.6c2

(notes encompassing changes in the last few PyPi releases that were undocumented until now)

Changes:

• Query only a subset documents based on doc ids by @PrimoUomo89 #94
• Return chunk ids in results thanks to @PrimoUomo89 #125
• Lower kmeans iterations when not necessary to run more #129
• Properly license the library as Apache-2 on PyPi

Fixes:

• Dynamically increase search hyper parameters for large k values and lower doc counts, reducing the number of situations where the total number of documents return is substantially below k #131
• Fix enabling the use of Training data processing with hard negatives turned off by @corrius #117
• Proper handling of different input types when pre-processing training triplets by @GautamR-Samagra #115