Improving performance for array slice (#555)

* Addressing issue 552:
#552

Improving performance for array slice

* Removing unused import

Author: QSilver

detect_secrets/util/code_snippet.py

@@ -1,4 +1,3 @@
-import itertools
 from typing import Generator
 from typing import List
 
@@ -27,7 +26,7 @@ def get_code_snippet(
         target_line_index = lines_of_context
 
     return CodeSnippet(
-        snippet=list(itertools.islice(lines, start_line_index, end_line_index)),
+        snippet=lines[start_line_index:end_line_index],
         start_line=start_line_index,
         target_index=target_line_index,
     )