✨ Add -n option to prevent newline after emoji (#12)

Adds another commandline option `-n` to the application which prevents
newlines from being added at the end of each output.
Disabled by default.

Co-authored-by: Marty Oehme <marty.oehme@gmail.com>

test/bemoji_cmds.bats

@@ -63,3 +63,15 @@ typing result"
     BEMOJI_DEFAULT_CMD="echo my custom command" BEMOJI_CLIP_CMD="echo my clipping" run bemoji -c 3>&-
     assert_output "my clipping"
 }
+
+@test "Prints output with newline by default" {
+    bats_require_minimum_version 1.5.0
+    BEMOJI_PICKER_CMD="echo heart" run --keep-empty-lines -- bemoji -e
+    assert_output --regexp '^heart\n$'
+}
+
+@test "Prints output without newline on -n option" {
+    bats_require_minimum_version 1.5.0
+    BEMOJI_PICKER_CMD="echo heart" run --keep-empty-lines -- bemoji -ne
+    assert_output --regexp '^heart$'
+}