revise the english readme documentation

-remove empty words for more concise wording
-fix grammar
-change hesitance to hesitation
-amend Tuntime to Runtime

README.md

@@ -19,10 +19,9 @@
 mobile heterogeneous computing platforms. The design focuses on the following
 targets:
 * Performance
-  * The runtime is highly optimized with NEON, OpenCL and Hexagon, and
+  * Runtime is optimized with NEON, OpenCL and Hexagon, and
     [Winograd algorithm](https://arxiv.org/abs/1509.09308) is introduced to
-    speed up the convolution operations. Besides the fast inference speed, the
-    initialization part is also intensively optimized to be faster.
+    speed up convolution operations. The initialization is also optimized to be faster.
 * Power consumption
   * Chip dependent power options like big.LITTLE scheduling, Adreno GPU hints are
     included as advanced APIs.
@@ -35,11 +34,11 @@ targets:
     The core library tries to keep minimum external dependencies to keep the
     library footprint small.
 * Model protection
-  * Model protection is the highest priority feature from the beginning of 
+  * Model protection has been the highest priority since the beginning of 
     the design. Various techniques are introduced like converting models to C++
     code and literal obfuscations.
 * Platform coverage
-  * A good coverage of recent Qualcomm, MediaTek, Pinecone and other ARM based
+  * Good coverage of recent Qualcomm, MediaTek, Pinecone and other ARM based
     chips. CPU runtime is also compatible with most POSIX systems and
     architectures with limited performance.
 
@@ -61,8 +60,8 @@ phones. The benchmark results can be found in [the CI result page](https://gitla
 * QQ群: 756046893
 
 ## Contributing
-Any kind of contributions are welcome. For bug reports, feature requests,
-please just open an issue without any hesitance. For code contributions, it's
+Any kind of contribution is welcome. For bug reports, feature requests,
+please just open an issue without any hesitation. For code contributions, it's
 strongly suggested to open an issue for discussion first. For more details,
 please refer to [the contribution guide](https://mace.readthedocs.io/en/latest/development/contributing.html).