add new contributors

Translators.md

@@ -7,14 +7,50 @@ Team lead (co-ordinator)
 Members
 
 * [Riku Takei][takei_riku]: Assistant Research Fellow (University of Otago, Dunedin, New Zealand)
+  * Lesson organiser (Git)
   * GitHub: [@rikutakei](https://github.com/rikutakei)
   * Twitter: [@rikutakei](http://twitter.com/rikutakei)
 
 * [Joel Nitta][nitta_joel]: Postdoctoral Researcher (National Museum of Nature and Science, Tsukuba, Japan)
+  * Reviewer and technical support
   * GitHub: [@joelnitta](https://github.com/joelnitta)
   * Twitter: [@joel_nitta](http://twitter.com/joel_nitta)  
   * [Homepage](https://joelnitta.com)  
 
+* [Maki Arakaki][arakaki_maki]
+  * Lesson organiser (R gapminder)
+  * GitHub: [@rkkmk](https://github.com/rkkmk)
+
+* [Daichi Saito][arakaki_maki]
+  * Lesson contributor (R gapminder)
+  * GitHub: [@rkkmk](https://github.com/DaichiSaitoAF)
+  * Twitter: [@daichibaa](http://githut.com/daichibaa)
+
+* [Tomohiro Egawa][egawa_tomohiro]
+  * Lesson contributor (R gapminder)
+  * GitHub: [@](https://github.com/)
+  * Twitter: [@bakamyudatri](http://twitter.com/bakamyudatri)
+
+* [Kyoko Matsumura][matsumura_kyoko]
+  * Lesson organiser (Shell)
+  * GitHub: [@kyyonko](https://github.com/kyyonko)
+  * Twitter: [@kyyonko](http://twitter.com/kyyonko)
+
+* [Kozo Nishida][nishida_kozo]: Technical Scientist (RIKEN BDR, Osaka, Japan) 
+  * Lesson organiser (Python)
+  * GitHub: [@kozo2](https://github.com/kozo2)
+  * Twitter: [@kozo2](http://twitter.com/kozo2)
+
+* [Manabu Ishii][ishii_manabu]: Technical Scientist (RIKEN BDR, Wako, Japan)
+  * Translation contributor and reviewer
+  * GitHub: [@manabuishii](https://github.com/manabuishii)
+  * Twitter: [@manabuishiirb](http://twitter.com/manabuishiirb)
+
+* [Koki Mimura][mimura_koki]: Postdoctoral Researcher (Tokyo University of Agriculture and Technology, Tokyo, Japan)
+  * Translation contributor and reviewer
+  * GitHub: [@manabuishii](https://github.com/manabuishii)
+  * Twitter: [@kilometer00](http://twitter.com/kilometer00)
+
 Please include your GitHub account and any other detail that you wish to be public.
 
 * [GivenName FamilyName][family_given]: Job title (Affiliation, location)