Replacing tab with spaces

Author: simonsan

SUMMARY.md

@@ -2,31 +2,31 @@
 
 - [Introduction](./intro.md)
 - [Idioms](./idioms/README.md)
-	* [Concatenating Strings with `format!`](./idioms/concat-format.md)
-	* [Constructor](./idioms/ctor.md)
-	* [The `Default` Trait](./idioms/default.md)
-	* [Collections Are Smart Pointers](./idioms/deref.md)
-	* [Finalisation in Destructors](./idioms/dtor-finally.md)
-	* [`mem::replace(_)`](./idioms/mem-replace.md)
-	* [On-Stack Dynamic Dispatch](./idioms/on-stack-dyn-dispatch.md)
-	* [Iterating over an `Option`](./idioms/option-iter.md)
-	* [Pass Variables to Closure](./idioms/pass-var-to-closure.md)
-	* [Privacy For Extensibility](./idioms/priv-extend.md)
-	* [Easy doc initialization](./idioms/rustdoc-init.md)
-	* [Temporary mutability](./idioms/temporary-mutability.md)
-	
+    - [Concatenating Strings with `format!`](./idioms/concat-format.md)
+    - [Constructor](./idioms/ctor.md)
+    - [The `Default` Trait](./idioms/default.md)
+    - [Collections Are Smart Pointers](./idioms/deref.md)
+    - [Finalisation in Destructors](./idioms/dtor-finally.md)
+    - [`mem::replace(_)`](./idioms/mem-replace.md)
+    - [On-Stack Dynamic Dispatch](./idioms/on-stack-dyn-dispatch.md)
+    - [Iterating over an `Option`](./idioms/option-iter.md)
+    - [Pass Variables to Closure](./idioms/pass-var-to-closure.md)
+    - [Privacy For Extensibility](./idioms/priv-extend.md)
+    - [Easy doc initialization](./idioms/rustdoc-init.md)
+    - [Temporary mutability](./idioms/temporary-mutability.md)
+
 - [Design Patterns](./patterns/README.md)
-	* [Builder](./patterns/builder.md)
-	* [Compose Structs](./patterns/compose-structs.md)
-	* [Entry API](./patterns/entry.md)
-	* [Fold](./patterns/fold.md)
-	* [Late Bound Bounds](./patterns/late-bounds.md)
-	* [Newtype](./patterns/newtype.md)
-	* [RAII Guards](./patterns/RAII.md)
-	* [Prefer Small Crates](./patterns/small-crates.md)
-	* [Contain unsafety in small modules](./patterns/unsafe-mods.md)
-	* [Visitor](./patterns/visitor.md)
+    - [Builder](./patterns/builder.md)
+    - [Compose Structs](./patterns/compose-structs.md)
+    - [Entry API](./patterns/entry.md)
+    - [Fold](./patterns/fold.md)
+    - [Late Bound Bounds](./patterns/late-bounds.md)
+    - [Newtype](./patterns/newtype.md)
+    - [RAII Guards](./patterns/RAII.md)
+    - [Prefer Small Crates](./patterns/small-crates.md)
+    - [Contain unsafety in small modules](./patterns/unsafe-mods.md)
+    - [Visitor](./patterns/visitor.md)
 
 - [Anti-patterns](./anti_patterns/README.md)
-	* [`#[deny(warnings)]`](./anti_patterns/deny-warnings.md)
-	* [Deref Polymorphism](./anti_patterns/deref.md)
+    - [`#[deny(warnings)]`](./anti_patterns/deny-warnings.md)
+    - [Deref Polymorphism](./anti_patterns/deref.md)