chore(readme): update readme to exp support

Author: mpaland

README.md

@@ -28,7 +28,7 @@ Therefore I decided to write an own, final implementation which meets the follow
  - Support of decimal/floating number representation (with an own fast itoa/ftoa)
  - Reentrant and thread-safe, malloc free, no static vars/buffers
  - LINT and compiler L4 warning free, mature, coverity clean, automotive ready
- - Extensive test suite (> 390 test cases) passing
+ - Extensive test suite (> 400 test cases) passing
  - Simply the best *printf* around the net
  - MIT license
 
@@ -162,19 +162,19 @@ int length = sprintf(NULL, "Hello, world"); // length is set to 12
 
 | Name | Default value | Description |
 |------|---------------|-------------|
-| PRINTF_INCLUDE_CONFIG_H          | undefined | Define this as compiler switch (e.g. `gcc -DPRINTF_INCLUDE_CONFIG_H`) to include a "printf_config.h" definition file |
-| PRINTF_NTOA_BUFFER_SIZE          | 32        | ntoa (integer) conversion buffer size. This must be big enough to hold one converted numeric number _including_ leading zeros, normally 32 is a sufficient value. Created on the stack |
-| PRINTF_FTOA_BUFFER_SIZE          | 32        | ftoa (float) conversion buffer size. This must be big enough to hold one converted float number _including_ leading zeros, normally 32 is a sufficient value. Created on the stack |
-| PRINTF_DISABLE_SUPPORT_FLOAT     | undefined | Define this to disable floating point (%f) support |
+| PRINTF_INCLUDE_CONFIG_H            | undefined | Define this as compiler switch (e.g. `gcc -DPRINTF_INCLUDE_CONFIG_H`) to include a "printf_config.h" definition file |
+| PRINTF_NTOA_BUFFER_SIZE            | 32        | ntoa (integer) conversion buffer size. This must be big enough to hold one converted numeric number _including_ leading zeros, normally 32 is a sufficient value. Created on the stack |
+| PRINTF_FTOA_BUFFER_SIZE            | 32        | ftoa (float) conversion buffer size. This must be big enough to hold one converted float number _including_ leading zeros, normally 32 is a sufficient value. Created on the stack |
+| PRINTF_DEFAULT_FLOAT_PRECISION     | 6         | Define the default floating point precision |
+| PRINTF_MAX_FLOAT                   | 1e9       | Define the largest suitable value to be printed with %f, before using exponential representation |
+| PRINTF_DISABLE_SUPPORT_FLOAT       | undefined | Define this to disable floating point (%f) support |
 | PRINTF_DISABLE_SUPPORT_EXPONENTIAL | undefined | Define this to disable exponential floating point (%e) support |
-| PRINTF_DISABLE_SUPPORT_LONG_LONG | undefined | Define this to disable long long (%ll) support |
-| PRINTF_DISABLE_SUPPORT_PTRDIFF_T | undefined | Define this to disable ptrdiff_t (%t) support |
+| PRINTF_DISABLE_SUPPORT_LONG_LONG   | undefined | Define this to disable long long (%ll) support |
+| PRINTF_DISABLE_SUPPORT_PTRDIFF_T   | undefined | Define this to disable ptrdiff_t (%t) support |
 
 
 ## Caveats
-- The internal floating point conversion has a maximum precision of 9 digits. Any higher precision is truncated after the 9th digit and zeros are returned.
-  So `printf("%.12f", 42.89522312345678)` gives `42.895223123000`.
-- Exponential floating point format (e.g. `"%.10e"` to get `1.167e+65`) for large numbers is not supported yet. Sorry.
+None anymore (finally).
 
 
 ## Test Suite