Merge pull request #174 from dhairyagandhi96/typo

Typo

Author: DhairyaLGandhi

src/impl/conv_direct.jl

@@ -40,7 +40,7 @@ By defaulting `beta` to `false`, we make use of the Bradbury promotion trick to
 `y` are `NaN`.
 
 The basic implementation performs 3-dimensional convolution; 1-dimensional and 2-
-dimensional casesa are supported by simply reshaping `y`, `x` and `w`, for which
+dimensional cases are supported by simply reshaping `y`, `x` and `w`, for which
 wrapper methods are available.
 """
 conv_direct!