Fix some issues

Some issues ares detected when 
- There are white spaces before and/or after when send press multiple keys 
- There is a empty line at the end of the file (index out of bound) 
- When default delay is modified, single or multiple key remain pressed during default delay period. 

144: Fix white spaces after line
189: Prevent from key still pressed when default delay is more than zero.
202: Prevent error index out of bound whet read last line
203: Fix

Author: ramsrq

adafruit_ducky.py

@@ -141,6 +141,7 @@ def loop(  # pylint: disable=too-many-return-statements
         if line is None:
             try:
                 line = self.lines[0]
+                line = line.strip() # Fix
             except IndexError:
                 print("Done!")
                 return False
@@ -185,10 +186,10 @@ def loop(  # pylint: disable=too-many-return-statements
 
             self.write_key(start)
             if len(words) == 1:
+                self.keyboard.release_all() 
                 time.sleep(self.default_delay)
                 self.last = self.lines[0]
                 self.lines.pop(0)
-                self.keyboard.release_all()
                 return True
             if len(words[1]):
                 self.loop(line=words[1])
@@ -198,8 +199,8 @@ def loop(  # pylint: disable=too-many-return-statements
 
         self.keyboard.release_all()
         time.sleep(self.default_delay)
-        self.last = self.lines[0]
-        self.lines.pop(0)
+        # self.last = self.lines[0]
+        # self.lines.pop(0)
         return True
 
     def write_key(self, start: str) -> None: