Update libicu download link

Author: misl6

pythonforandroid/recipes/icu/__init__.py

@@ -11,8 +11,10 @@ class ICURecipe(Recipe):
     name = 'icu4c'
     version = '57.1'
     major_version = version.split('.')[0]
-    url = ('http://download.icu-project.org/files/icu4c/'
-           '{version}/icu4c-{version_underscore}-src.tgz')
+    url = (
+        "https://github.com/unicode-org/icu/releases/download/"
+        "release-{version_hyphen}/icu4c-{version_underscore}-src.tgz"
+    )
 
     depends = ['hostpython3']  # installs in python
     patches = ['disable-libs-version.patch']
@@ -34,7 +36,8 @@ def versioned_url(self):
             return None
         return self.url.format(
             version=self.version,
-            version_underscore=self.version.replace('.', '_'))
+            version_underscore=self.version.replace('.', '_'),
+            version_hyphen=self.version.replace('.', '-'))
 
     def get_recipe_dir(self):
         """