Adding emdash

manuscript/converted/chapter4.txt

@@ -2,12 +2,12 @@
 
 # Dependency Management {#dependency_management_title}
 
-There are a ton of PHP libraries, frameworks, and components to choose from. Your project will likely use 
-several of them — these are project dependencies. Until recently, PHP did not have a good way to manage
+There are a ton of PHP libraries, frameworks, and components to choose from. Your project will likely use
+several of them – these are project dependencies. Until recently, PHP did not have a good way to manage
 these project dependencies. Even if you managed them manually, you still had to worry about autoloaders.
 That is no longer an issue.
 
-Currently there are two major package management systems for PHP - [Composer] and [PEAR]. Composer is currently
+Currently there are two major package management systems for PHP – [Composer] and [PEAR]. Composer is currently
 the most popular package manager for PHP, however for a long time PEAR was the primary package manager in use.
 Knowing PEAR's history is a good idea, since you may still find references to it even if you never use it.