Install for Debian Stretch

Install libssl1.0-dev instead of libssl-dev.

doc/readme-qt.rst

@@ -4,8 +4,8 @@ BlackCoin-qt: Qt5 GUI for BlackCoin
 Build instructions
 ===================
 
-Debian
--------
+Debian Jessie
+--------------
 
 First, make sure that the required packages for Qt5 development of your
 distribution are installed, for Debian and Ubuntu these are:
@@ -29,6 +29,12 @@ Alternatively, install Qt Creator and open the `blackcoin-qt.pro` file.
 An executable named `blackcoin-qt` will be built.
 
 
+Debian Stretch
+--------------
+
+Install libssl1.0-dev instead of libssl-dev
+
+
 Windows
 --------