Use HTTPS to access QBLAST

See http://www.ncbi.nlm.nih.gov/mailman/pipermail/utilities-announce/2016-June/000104.html

As of 1 September 2016, the NCBI seem to be planning to
automatically redirect HTTP connections to HTTPS. From
initial testing HTTPS support is already live, so we can
make the switch now.

Bio/Blast/NCBIWWW.py

@@ -9,8 +9,7 @@
 """Code to invoke the NCBI BLAST server over the internet.
 
 This module provides code to work with the WWW version of BLAST
-provided by the NCBI.
-http://blast.ncbi.nlm.nih.gov/
+provided by the NCBI. https://blast.ncbi.nlm.nih.gov/
 """
 
 from __future__ import print_function
@@ -22,7 +21,7 @@
 from Bio._py3k import Request as _Request
 
 
-NCBI_BLAST_URL = "http://blast.ncbi.nlm.nih.gov/Blast.cgi"
+NCBI_BLAST_URL = "https://blast.ncbi.nlm.nih.gov/Blast.cgi"
 
 
 def qblast(program, database, sequence, url_base=NCBI_BLAST_URL,

NEWS

@@ -32,7 +32,7 @@ added to Bio.Data (and the translation functionality), and table 11 is now
 also available under the alias Archaeal.
 
 In line with NCBI website changes, Biopython now uses HTTPS rather than HTTP
-to connect to the NCBI Entrez API.
+to connect to the NCBI Entrez and QBLAST API.
 
 Additionally, a number of small bugs have been fixed with further additions
 to the test suite, and there has been further work to follow the Python PEP8