Spelling fixes

Spelling errors found using github.com/lucasdemarchi/codespell
A tool to fix common misspellings.
This tool is licensed under GNU General Public License, version 2.

Change-Id: I8da47d0cc4531fe83cf09ed311bea35014f05659
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/snmp_serialize.hpp b/snmp_serialize.hpp
index 044d784..2031e22 100644
--- a/snmp_serialize.hpp
+++ b/snmp_serialize.hpp
@@ -10,7 +10,7 @@
 namespace snmp
 {
 
-constexpr auto SEPRATOR = "_";
+constexpr auto SEPARATOR = "_";
 
 namespace fs = std::experimental::filesystem;