Fix URLs

Author: jimhester

NEWS.md

@@ -53,7 +53,7 @@ without Warnings (@nuest, #267)
 
 ## New Features
 
-* xml2 now has a pkgdown site! <http://xml2.r-lib.org> (@jayhesselberth, #211).
+* xml2 now has a pkgdown site! <https://xml2.r-lib.org> (@jayhesselberth, #211).
 
 * Windows: upgrade to libxml2 2.9.8
 

README.md

@@ -5,7 +5,7 @@
 [![Coverage Status](https://img.shields.io/codecov/c/github/r-lib/xml2/master.svg)](https://codecov.io/github/r-lib/xml2?branch=master)
 <!-- badges: end -->
 
-The xml2 package is a binding to [libxml2](http://xmlsoft.org), making it easy to work with HTML and XML from R. The API is somewhat inspired by [jQuery](http://jquery.com).
+The xml2 package is a binding to [libxml2](http://xmlsoft.org), making it easy to work with HTML and XML from R. The API is somewhat inspired by [jQuery](https://jquery.com).
 
 ## Installation
 

vignettes/modification.Rmd

@@ -171,7 +171,7 @@ gc()
 ## Namespaces ##
 
 We want to construct a document with the following namespace layout. (From
-http://stackoverflow.com/questions/32939229/creating-xml-in-r-with-namespaces/32941524#32941524).
+https://stackoverflow.com/questions/32939229/creating-xml-in-r-with-namespaces/32941524#32941524).
 ```xml
 <?xml version = "1.0" encoding="UTF-8"?>
 <sld xmlns="http://www.o.net/sld"