Tag open source release 1.1.8.

PiperOrigin-RevId: 289675084

NEWS

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+Snappy v1.1.8, January 15th 2020:
+
+  * Small performance improvements.
+
+  * Removed snappy::string alias for std::string.
+
+  * Improved CMake configuration.
+
 Snappy v1.1.7, August 24th 2017:
 
   * Improved CMake build support for 64-bit Linux distributions.