fixed a typo in one of my earliest blog entries that was driving me up the wall ever since i noticed it

_input/posts/2019-06-18-i-know-nothing-i-see-nothing-i-hear-nothing.markdown

@@ -30,7 +30,7 @@ knowing it was there to *thinking that you knew* it was there. it
 wasn't knowledge, just an errant belief.
 
 to be able to truly know something (and i'm skipping a few steps
-here), you must be able to logically prove it's truth with absolutely
+here), you must be able to logically prove its truth with absolutely
 no possibility of error. pure logic assumes nothing. the closest thing
 to pure logic that i am aware of is maths. mathematics is based on six
 assumptions, for example: