accept MA and Master for @mastersthesis
accept MA and Master for @mastersthesis

retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex,retorquere/zotero-better-bibtex