Update README.markdown

Mention that building module for php 7 requires `php7` branch. Found it out in #169
iliaal · Sep 3, 2016 · 5d68d8d · 5d68d8d
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diff --git a/README.markdown b/README.markdown
@@ -27,6 +27,9 @@ cd php-5.x.x
 # clone repository into php extension dir
 git clone https://github.com/iliaal/php_excel.git ext/excel
 
+# to build php7 module, you should use php7 git branch
+cd ext/excel && git checkout php7 && cd ../..
+
 # rebuild configure
 ./buildconf --force