Update to 3.6.3, pip 9.0.1

Author: docker-library-bot

3.6/windows/windowsservercore/Dockerfile

@@ -13,7 +13,7 @@ ENV PYTHON_RELEASE 3.6.3
 
 RUN $url = ('https://www.python.org/ftp/python/{0}/python-{1}-amd64.exe' -f $env:PYTHON_RELEASE, $env:PYTHON_VERSION); \
 	Write-Host ('Downloading {0} ...' -f $url); \
-	Invoke-WebRequest -Uri $url -OutFile python.exe; \
+	Invoke-WebRequest -Uri $url -OutFile 'python.exe'; \
 	\
 	Write-Host 'Installing ...'; \
 # https://docs.python.org/3.5/using/windows.html#installing-without-ui
@@ -45,7 +45,7 @@ ENV PYTHON_PIP_VERSION 9.0.1
 
 RUN Write-Host ('Installing pip=={0} ...' -f $env:PYTHON_PIP_VERSION); \
 	[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; \
-	Invoke-WebRequest -Uri https://bootstrap.pypa.io/get-pip.py -OutFile get-pip.py; \
+	Invoke-WebRequest -Uri 'https://bootstrap.pypa.io/get-pip.py' -OutFile 'get-pip.py'; \
 	python get-pip.py \
 		--disable-pip-version-check \
 		--no-cache-dir \