updated .gitignore using https://www.gitignore.io
updated .gitignore using https://www.gitignore.io

tdziurko/jvm-bloggers,tdziurko/jvm-bloggers,jvm-bloggers/jvm-bloggers,kraluk/jvm-bloggers,tdziurko/jvm-bloggers,kraluk/jvm-bloggers,jvm-bloggers/jvm-bloggers,szpak/jvm-bloggers,szpak/jvm-bloggers,kraluk/jvm-bloggers,tdziurko/jvm-bloggers,szpak/jvm-bloggers,kraluk/jvm-bloggers,szpak/jvm-bloggers,sobkowiak/jvm-bloggers,jvm-bloggers/jvm-bloggers,sobkowiak/jvm-bloggers,jvm-bloggers/jvm-bloggers