Update Changelog.txt with the 0.3.11 changes

diff --git a/Changelog.txt b/Changelog.txt
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 OpenBLAS ChangeLog
 ====================================================================
+Version 0.3.11
+ 17-Oct-2020
+
+ common:
+       * API change:
+         the newly added BFLOAT16 functions were renamed to use the
+         letter "B" instead of "H" to avoid potential confusion with
+         the IEEE "half precision float" type, i.e. the 0.3.10
+         SHGEMM is now SBGEMM and the corresponding build option
+         was changed from "BUILD_HALF" to "BUILD_BFLOAT16".
+       * Reduced the default BLAS3_MEM_ALLOC_THRESHOLD (used as an upper
+         limit for placing temporary arrays on the stack) to be compatible
+         with a stack size of 1mb (as imposed by the JAVA runtime library) 
+       * Added mixed-precision dot function SBDOT and utility functions
+         shstobf16, shdtobf16, sbf16tos and dbf16tod to convert between
+         single or double precision float arrays and bfloat16 arrays
+       * Fixed prototypes of LAPACK_?ggsvp and LAPACK_?ggsvd functions
+         in lapack.h
+       * Fixed underflow and rounding errors in LAPACK SLANV2 and DLANV2
+         (causing miscalculations in e.g. SHSEQR/DHSEQR, LAPACK issue #263)
+       * Fixed workspace calculation in LAPACK ?GELQ (LAPACK issue #415)
+       * Fixed several bugs in the LAPACK testsuite
+       * Improved performance of TRMM and TRSM for certain problem sizes
+       * Fixed infinite recursions and workspace miscalculations in ReLAPACK
+       * CMAKE builds no longer require pkg-config for creating the .pc file
+       * Makefile builds no longer misread NO_CBLAS=0 or NO_LAPACK=0 as 
+         enabling these options
+       * Fixed detection of gfortran when invoked through an mpi wrapper
+       * Improve thread reinitialization performance with OpenMP xafter a fork 
+       * Added support for building only the subset of the library required
+         for a particular precision by specifying BUILD_SINGLE, BUILD_DOUBLE
+       * Optional function name prefixes and suffixes are now correctly
+         reflected in the generated cblas.h
+       * Added CMAKE build support for the LAPACK and multithreading tests
+
+POWER:
+       * Added optimized support for POWER10
+       * Added support for compiling for POWER8 in 32bit mode
+       * Added support for compilation with LLVM/clang
+       * Added support for compilation with NVIDIA/PGI compilers
+       * Fixed building on big-endian POWER8
+       * Fixed miscompilation of ZDOTC by gcc10
+       * Fixed alignment errors in the POWER8 SAXPY kernel
+       * Improved CPU detection on AIX
+       * Supported building with older compilers on POWER9
+
+x86_64:
+       * Added support for Intel Cooperlake
+       * Added autodetection of AMD Renoir/Matisse/Zen3 cpus
+       * Added autodetection of Intel Comet Lake cpus
+       * Reimplemented ?sum, ?dot and daxpy using universal intrinsics
+       * Reset the fpu state before using the fpu on Windows as a workaround
+         for a problem introduced in Windows 10 build 19041 (a.k.a. SDK 2004)
+       * Fixed potentially undefined behaviour in the dot and gemv_t kernels
+       * Fixed a potential segmentation fault in DYNAMIC_ARCH builds
+       * Fixed building for ZEN with PGI/NVIDIA and AMD AOCC compilers
+       
+ARMV7:
+       * Fixed cpu detection on BSD-like systems
+
+ARMV8:
+       * Added preliminary support for Apple Vortex cpus
+       * Added support for the Cavium ThunderX3T110 cpu
+       * Fixed cpu detection on BSD-like systems
+       * Fixed compilation in -std=C18 mode
+
+
+IBM Z:
+       * Added support for compiling with the clang compiler
+       * Improved GEMM performance on Z14
+
+====================================================================
 Version 0.3.10
  14-Jun-2020