Update readme

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Account for fb2 books without covers

lector/parsers/comicbooks.py

@@ -19,10 +19,13 @@
 
 import os
 import time
+import logging
 import zipfile
 
 from lector.rarfile import rarfile
 
+logger = logging.getLogger(__name__)
+
 
 class ParseCOMIC:
     def __init__(self, filename, *args):

lector/parsers/epub.py

@@ -16,9 +16,12 @@
 
 import os
 import zipfile
+import logging
 
 from lector.readers.read_epub import EPUB
 
+logger = logging.getLogger(__name__)
+
 
 class ParseEPUB:
     def __init__(self, filename, temp_dir, file_md5):

lector/parsers/fb2.py

@@ -15,9 +15,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import os
+import logging
 
 from lector.readers.read_fb2 import FB2
 
+logger = logging.getLogger(__name__)
+
 
 class ParseFB2:
     def __init__(self, filename, temp_dir, file_md5):

lector/parsers/mobi.py

@@ -21,10 +21,13 @@ import os
 import sys
 import shutil
 import zipfile
+import logging
 
 from lector.readers.read_epub import EPUB
 import lector.KindleUnpack.kindleunpack as KindleUnpack
 
+logger = logging.getLogger(__name__)
+
 
 class ParseMOBI:
     def __init__(self, filename, temp_dir, file_md5):

lector/parsers/pdf.py

@@ -20,12 +20,15 @@
 
 import io
 import os
+import logging
 
 from PyQt5 import QtCore
 from bs4 import BeautifulSoup
 
 import popplerqt5
 
+logger = logging.getLogger(__name__)
+
 
 class ParsePDF:
     def __init__(self, filename, *args):