Remove extra brackets in {{monospaced}} (#21)

diff --git a/migration/src/jira_util.py b/migration/src/jira_util.py
index 157803f..d6db7e1 100644
--- a/migration/src/jira_util.py
+++ b/migration/src/jira_util.py
@@ -6,10 +6,10 @@
 import jira2markdown
 from jira2markdown.elements import MarkupElements
 from jira2markdown.markup.lists import UnorderedList, OrderedList
-from jira2markdown.markup.text_effects import BlockQuote, Quote
+from jira2markdown.markup.text_effects import BlockQuote, Quote, Monospaced
 
 from markup.lists import UnorderedTweakedList, OrderedTweakedList
-from markup.text_effects import TweakedBlockQuote, TweakedQuote
+from markup.text_effects import TweakedBlockQuote, TweakedQuote, TweakedMonospaced
 
 @dataclass
 class Attachment(object):
@@ -207,6 +207,7 @@
     elements.replace(OrderedList, OrderedTweakedList)
     elements.replace(BlockQuote, TweakedBlockQuote)
     elements.replace(Quote, TweakedQuote)
+    elements.replace(Monospaced, TweakedMonospaced)
     text = jira2markdown.convert(text, elements=elements)
 
     # markup @ mentions with ``
diff --git a/migration/src/markup/text_effects.py b/migration/src/markup/text_effects.py
index 61f541d..f180370 100644
--- a/migration/src/markup/text_effects.py
+++ b/migration/src/markup/text_effects.py
@@ -4,16 +4,11 @@
     ParserElement,
     ParseResults,
     QuotedString,
-    StringEnd,
     StringStart,
     SkipTo,
     Literal,
     LineEnd,
-    Optional,
     Combine,
-    White,
-    OneOrMore,
-    nums,
     replaceWith,
 
 )
@@ -49,3 +44,16 @@
             Literal("bq. ").setParseAction(replaceWith("> "))
             + SkipTo(LineEnd()) + LineEnd().setParseAction(replaceWith("\n\n")) # needs additional line feed at the end of quotation to preserve indentation
         )
+
+
+class TweakedMonospaced(AbstractMarkup):
+    def action(self, tokens: ParseResults) -> str:
+        # remove extra brackets in {{monospaced}}
+        # e.g. {{{}BooleanScorer{}}}
+        token = re.sub(r"^[{}]+", "", tokens[0])
+        token = re.sub(r"[{}]+$", "", token)
+        return f"`{token}`"
+
+    @property
+    def expr(self) -> ParserElement:
+        return QuotedString("{{", endQuoteChar="}}").setParseAction(self.action)