Update documentation

CONTRIBUTING.md

@@ -35,9 +35,7 @@ sentence on a separate line. Do **not** rename the test data files.
 language's ISO 639-1 code and put the language model files into it.
 Look at the other languages' directories to see how it looks like. It should be pretty self-explanatory.
 8. Put the test data files in [`/language-testdata`][testdata directory url].
-9. Add the new language to the functions in [`unigrams.go`][unigrams url], [`bigrams.go`][bigrams url],
-[`trigrams.go`][trigrams url], [`quadrigrams.go`][quadrigrams url] and [`fivegrams.go`][fivegrams url].
-Add it to [`/cmd/accuracy_reporter.go`][accuracy reporter url] as well.
+9. Add the new language to [`/cmd/accuracy_reporter.go`][accuracy reporter url] as well.
 10. Fix the existing unit tests by adding your new language.
 11. For accuracy report generation, run `go run cmd/accuracy_reporter.go`.
 12. Be happy! :-) You have successfully contributed a new language and have thereby significantly widened
@@ -55,9 +53,4 @@ this library's fields of application.
 [test data files writer url]: https://github.com/pemistahl/lingua-go/blob/main/writer.go#L194
 [language models directory url]: https://github.com/pemistahl/lingua-go/tree/main/language-models
 [testdata directory url]: https://github.com/pemistahl/lingua-go/tree/main/language-testdata
-[unigrams url]: https://github.com/pemistahl/lingua-go/blob/main/unigrams.go
-[bigrams url]: https://github.com/pemistahl/lingua-go/blob/main/bigrams.go
-[trigrams url]: https://github.com/pemistahl/lingua-go/blob/main/trigrams.go
-[quadrigrams url]: https://github.com/pemistahl/lingua-go/blob/main/quadrigrams.go
-[fivegrams url]: https://github.com/pemistahl/lingua-go/blob/main/fivegrams.go
 [accuracy reporter url]: https://github.com/pemistahl/lingua-go/blob/main/cmd/accuracy_reporter.go

README.md

@@ -243,7 +243,7 @@ Erroneously classified as Dutch: 0.20%, Latin: 0.10%
 
 ## 7. <a name="library-dependency"></a> How to add it to your project? <sup>[Top ▲](#table-of-contents)</sup>
 
-    go get github.com/pemistahl/[email protected].2
+    go get github.com/pemistahl/[email protected].3
 
 ## 8. <a name="library-build"></a> How to build? <sup>[Top ▲](#table-of-contents)</sup>
 

RELEASE_NOTES.md

@@ -1,3 +1,12 @@
+## Lingua 1.0.3 (released on 20 Oct 2021)
+
+### Improvements
+
+- By replacing [sync.Once](https://pkg.go.dev/sync#Once) with 
+  [sync.Map](https://pkg.go.dev/sync#Map) for storing the language models
+  at runtime, a large amount of code could be removed while preserving 
+  the same functionality. This improves code maintenance significantly.
+
 ## Lingua 1.0.2 (released on 13 Oct 2021)
 
 ### Bug Fixes